Question Text
Question 1 :
A stone is thrown in a vertically upward direction with a velocity of $5 m s^{-1}$. If the acceleration of the stone during its motion is $ 10 m s^{-2}$ in the downward direction, how much time will it take to reach there?
Question 2 :
An electron moving with a velocity of $5 × 10^4$ $ms^{-1}$ enters into a uniform electric field and acquires a uniform acceleration of 104 $ms^{–2}$ in the direction of its initial motion. How much distance the electron would cover in this time?
Question 3 :
What is the quantity which is measured by the area occupied below the velocity-time graph?
Question 4 :
A signal from a spaceship reached the ground station in five minutes. What was the distance of the spaceship from the ground station? The signal travels at the speed of light, that is, $3\times10^8 $m per second.
Question 5 :
Which of the following figures represent uniform motion of a moving object correctly?
Question 6 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d2f0f59b460d7261f65f.jpg' />
The speed-time graph for a car is shown in the the above figure. Which part of the graph represents uniform motion of the car?
Question 7 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d29cf59b460d7261f5ee.JPG' />
In the above figure, the velocity-time graph shows the motion of a cyclist. Find its acceleration.
Question 8 :
Usha swims in a 90 m long pool. She covers 180 m in one minute by swimming from one end to the other and back along the same straight path. What is the average velocity of Usha?
Question 9 :
The odometer of a car reads 2000 km at the start of a trip and 2400 km at the end of the trip. If the trip took 8 h, What is the average speed of the car in $ km h^{-1}$?
Question 10 :
A motorcyclist drives from A to B with a uniform speed of 30 km$h^{–1}$ and returns back with a speed of 20 km $h^{–1}$. Find its average speed.