Physics Mechanics

Question 1

A car accelerates uniformly from rest to a speed of 20 m/s in 5 seconds. What is the car’s acceleration?

Accepted Answer

4 m/s²

Answer

2 m/s²

Answer

5 m/s²

Answer

10 m/s²

Question 2

A 10 kg object is pushed with a net force of 50 N. What is its acceleration?

Accepted Answer

5 m/s²

Answer

2 m/s²

Answer

10 m/s²

Answer

50 m/s²

Question 3

A 2 kg ball moving at 3 m/s collides with a stationary 1 kg ball. After the collision, the 2 kg ball moves at 1 m/s. What is the velocity of the 1 kg ball if the collision is perfectly elastic?

Accepted Answer

2 m/s

Answer

3 m/s

Answer

4 m/s

Answer

6 m/s

Question 4

A 5 kg object is dropped from a height of 20 m. Ignoring air resistance, what is its velocity just before hitting the ground? (Take 𝑔=9.8m/s2 ).

Accepted Answer

28 m/s

Answer

14 m/s

Answer

20 m/s

Answer

40 m/s

Question 5

A block slides down a frictionless incline of height 5 m. What is its speed at the bottom? (Take 
𝑔=9.8m/s2).

Accepted Answer

10 m/s

Answer

5 m/s

Answer

9.8 m/s

Answer

15 m/s