Question 1 :
Find the gravitational potential energy of a $1kg$ mass kept at a height of $5m$ above the ground if $g=10ms^{-2}$.

Question 3 :
Name the type of energy (kinetic energy $K$ or potential energy $U$) possessed in a compressed spring:

Question 4 :
A body dropped freely from a height h onto a horizontal plane, bounces up and down and finally comes to rest. The coefficient of restitution is e, the ratio of distance travelled in two consecutive rebounds

Question 5 :
State whether the given statement is True or False :<br/>Both momentum and kinetic energy are conserved in all collisions.

Question 6 :
A lorry and a car with the same kinetic energy are brought to rest by the application of brakes which provide equal retarding forces. Which of them will come to rest in a shorter distance?

Question 7 :
A coconut fruit hanging high in a palm tree has ......... owing to its location.

Question 8 :
A machine gun fires 360 bullets per minute. Each bullet moves with a velocity of 600 ms$^{-1}$. If the power of the gun is 5.4 kw, the mass of each bullet is,

Question 9 :
A block of mass 3 $kg$ is released from the rest at top of the inclined plane. If length and height of the inclined plane is 6 m and 4 m respectively. Calculate its speed at the bottom of inclined plane. Assume the force of friction 16 N on the block is a constant.

Question 10 :
&#160;A $500$ gm gun fires a $2 gm$ projectile with a muzzle velocity of $1600ms^{-1}$. The velocity of the gun is:<br/>

Question 11 :
A man pushes a $10 kg$&#160;box at a constant velocity over a distance of $4 m$ on a rough horizontal surface.&#160;The coefficient of kinetic friction between the box and the floor is $0.3$. Calculate the work done by the person on the box?

Question 12 :
If there is a nonzero net force acting on an object for some time, which of the following must be true?<br>I. The object is gaining kinetic energy<br>II. The object experiences displacement<br>III. There is work being done on the object

Question 13 :
A force of $10 N$ displaces an object through $20 cm$ and does the work of $1 J$ in the process. Find the angle between the force and displacement.

Question 15 :
A particle of mass $m_{1}$ moving with a velocity of $5m/s$ collides head on with a stationary particle of&#160;mass $m_{2}$. After collision both the particle move with a common velocity of $4m/s$, then the value $m_<br/>{1}/m_{2}$ is:<br/>

Question 16 :
A cord is used to lower vertically a block of mass $M$ by a distance $d$ with constant downward acceleration $g/4$. Work done by the cord on the block is:

Question 17 :
Two particles are moving along two long straight lines, in the same plane with same speed $\displaystyle 20\ cm/s.$ The angle between the two lines is $\displaystyle 60^{o}$ and their intersection point is $O$. At a certain moment, the two particles are located at distance $3\ m$ and $4\ m$ from $O$, and are moving towards $O$. Subsequently, the shortest distance between them will be<br>

Question 18 :
A billiard ball of mass $M$ moving with velocity ${v}_{1}$ collides with another ball of the same mass but at rest. If the collision is elastic the angle of divergence after the collision is

Question 19 :
The total work done on a particle is equal to the change in its kinetic energy.This statement is true for which of the condition?

Question 20 :
Two charges $ + 5 \mu C $ and $ - 5 \mu C $ separated by $4 mm$ form an electric dipole. The dipole is placed in a uniform electric field of $ 4 \times 10^5 N/C $ . The work done in rotating the electric dipole through $180^o$ , if it starts from the positions of $ \theta = 0 $ is<br>