Mechanics

Question 1 of 10

A particle moves so that s = t³ − 6t² + 9t. It is momentarily at rest when t =

Question 2 of 10

A particle is projected horizontally at 10 m/s from a height of 20 m. How far does it travel horizontally before landing? (g = 10 m/s²)

Question 3 of 10

A ball is projected horizontally at 10 m/s from a height of 20 m (g = 10 m/s²). The time to reach the ground is

Question 4 of 10

A 5 kg mass is pulled up a smooth 30° incline by a force parallel to it. The force needed for constant velocity is (g = 10 m/s²)

Question 5 of 10

Three forces (2i + 3j), (−4i + j) and (ai + bj) are in equilibrium. Find a and b.

Question 6 of 10

A 2 kg ball moving at 6 m/s collides and sticks to a 1 kg ball at rest. The common velocity is

Question 7 of 10

A body of mass 4 kg moves with velocity (3i + 4j) m/s. What is its kinetic energy?

Question 8 of 10

Two forces of 6 N and 8 N act at right angles. Find their resultant.

Question 9 of 10

Two particles of masses 3 kg and 2 kg hang over a smooth pulley. The acceleration of the system is (g = 10 m/s²)

Question 10 of 10

A body of mass 2 kg moves with velocity 5 m/s. Find its kinetic energy.