Physics Mechanics 2

Question 1

A 5 kg box slides down a frictionless incline angled at 30° to the horizontal. What is the acceleration of the box?

Accepted Answer

4.9 m/s²

Answer

9.8 m/s²

Answer

8.5 m/s²

Answer

2.5 m/s²

Question 2

A car traveling at 20 m/s applies brakes and decelerates at 4 m/s². How long does it take to stop?

Accepted Answer

5 s

Answer

4 s

Answer

8 s

Answer

10 s

Question 3

Which of the following is a vector quantity?

Accepted Answer

Displacement

Answer

Speed

Answer

Mass

Answer

Temperature

Question 4

Two objects of masses 3 kg and 6 kg collide and stick together. If the 3 kg object was moving at 4 m/s and the 6 kg object was at rest, what is their combined velocity after collision?

Accepted Answer

1.33 m/s

Answer

2 m/s

Answer

4 m/s

Answer

0.67 m/s

Question 5

A projectile is launched horizontally from a cliff. Which statement about its motion is correct?

Accepted Answer

Horizontal and vertical motions are independent

Answer

Horizontal velocity increases due to gravity

Answer

Vertical velocity is constant throughout

Answer

The projectile follows a straight-line path

Question 6

What is the net work done on an object that moves in a complete circle at constant speed?

Accepted Answer

Zero

Answer

Equal to the kinetic energy

Answer

Positive

Answer

Negative

Question 7

A 10 kg object is raised 3 m vertically. What is the increase in its gravitational potential energy? (g = 9.8 m/s²)

Accepted Answer

294 J

Answer

30 J

Answer

98 J

Answer

980 J