Mechanics PYQ

A ball is thrown vertically upward with a velocity of 20 m/s. What is the maximum height reached? (Take g = 10 m/s²)

Two bodies of masses 4 kg and 6 kg are moving with velocities 2 m/s and 3 m/s respectively in the same direction. Find the velocity of the centre of mass.

The SI unit of force is

A body of mass 5 kg is acted upon by a force of 10 N for 3 seconds. The change in momentum of the body is: