Question 1 :
The acceleration of a body projected upwards with a certain velocity is
Question 2 :
If two particles of masses $3kg$ and $6kg$ which are at rest are separated by a distance of $15m$. The two particles are moving towards each other under a mutual force of attraction. Then the ratio of distances travelled by the particles before collision is <br/>
Question 3 : <p>A sign convention is used, the positive direction for position, velocity and acceleration is upward. A ball of mass m is thrown upward with velocity $V$ and caught during returning. Identify the signs of position, velocity and acceleration during ascending part of the trajectory.<br/></p><table class="wysiwyg-table"><tbody><tr><td></td><td>Position</td><td>Velocity</td><td>Acceleration</td></tr><tr><td>(A)</td><td>Positive</td><td>Positive</td><td>Positive</td></tr><tr><td>(B)</td><td>Positive</td><td>Positive</td><td>Negative</td></tr><tr><td>(C)</td><td>Positive</td><td>Negative</td><td>Negative</td></tr><tr><td>(D)</td><td>Negative</td><td>Positive</td><td>Negative</td></tr><tr><td>(E)</td><td>Negative</td><td>Negative</td><td>Negative</td></tr></tbody></table>
Question 4 : <p>A helicopter is flying south with a speed of $50\ kmh^{-1}$. A train is moving with the same speed towards east. The relative velocity of the helicopter as seen by the passengers in the train will be $50 \sqrt {2}\ kmh^{-1}$ towards</p>
Question 5 :
A body is thrown vertically upwards and rises to a height of 10 m. The velocity with which the body was thrown upwards is $\displaystyle \left( g=9.8{ m }/{ { s }^{ 2 } } \right) $
Question 6 :
If a ball is thrown vertically upwards with 40 m/s its velocity after two second will be:-
Question 7 :
A boy can throw a stone up to a maximum height of 10 m. The maximum horizontal distance that boy throw the same stone up will be
Question 8 :
A ball is thrown vertically up. If the ball reached at maximum height in $3s$. Assume air resistance is negligible. The initial velocity of the ball is most nearly :
Question 9 :
A body thrown up with a finite speed is caught back after 4 sec. The speed of the body with which it is thrown up is
Question 11 :
An iron ball and a wooden ball of the same radius are released from a height H in vacuum. The times taken by both of them of reach the ground are
Question 12 :
A body projected vertically up with a velocity of 10 m $s^{-1}$ reaches a height of 20 m. If it is projected with a velocity of 20 m $s^{-1}$ then the maximum height reached by the body will be :
Question 13 :
Two particles A and B having different masses are projected from a tower with same speed. A is projected vertically upward and B vertically downward. On reaching the ground.<br>
Question 14 :
A ball is released from the top of a height $h$. It takes time $T$ to reach the ground. What is the position of the ball (from ground) after time $\frac{T}{3}$
Question 15 : A sign convention is used, the positive direction for position, velocity and acceleration is upward. A ball of mass m is thrown upward with velocity $V$ and caught during returning. Identify the signs of position, velocity and acceleration during descending part of the trajectory.<table class="wysiwyg-table"><tbody><tr><td></td><td>Position</td><td>Velocity</td><td>Acceleration</td></tr><tr><td>(A)</td><td>Positive </td><td>Positive</td><td>Positive</td></tr><tr><td>(B)</td><td>Positive</td><td>Positive</td><td>Negative</td></tr><tr><td>(C)</td><td>Positive</td><td>Negative</td><td>Negative</td></tr><tr><td>(D)</td><td>Negative</td><td>Positive</td><td>Negative</td></tr><tr><td>(E)</td><td>Negative</td><td>Negative</td><td>Negative</td></tr></tbody></table>
Question 16 :
A ball is thrown directly upwards and reaches a maximum height $h$. When it is at height ${h}/{2}$, its speed relative to the initial speed ${v}_{0}$ it had when it was originally thrown is:
Question 17 :
A particle experiences constant acceleration for $20 s$ after starting from rest. If it travels a distance ${X}_{1}$, in the first $10 s$ and distance ${X}_{2}$, in the remaining $10 s$, then which of the following is true ?
Question 18 :
When a man stands on a moving escalator he goes up in $50\ sec.$ and when he walks up the moving escalator he goes up in $30\ sec.$ Then the man walks up the stationary escalator in a time of $----sec$
Question 19 :
A motorcycle is moving with a velocity 80km/hr ahead of a car moving with a velocity of 65 km/hr in the same direction. What is the relative velocity of the motorcycle with respect to the car :-
Question 20 :
Find the ratio of the distances traveled by a body falling freely from rest in the first, second and third seconds respectively.
