Calculate the work done by the brakes of a car of mass 1000 kg when its speed is reduced from 20 m/s to10 m/s ?

Calculate the work done to take an object of mass 20 kg to a height of 10 m.

Calculate the work done to take an object of mass 20 kg to a height of 10 m. (g = 9.8 m/s2)

The car A of mass 1000 kg travelling at 25 m//s collides with another car B of mass 1500 kg moving with a speed of 20 m//s in the same direction, the velocity of car A becomes 15 m//s , what would be the velocity of car B ?

Does the kinetic energy of a car change more when it goes from 10 m/s to 20 m/s or when it goes from 20 m/s to 30 m/s ?

Calculate the work done in increasing the angular velocity of a wheel of moment of inertia 200 kg m_2 from 20 rev/s to 40 rev/s.

A bullet of mass 10^-3kg strikes an obstacle and moves at 60^@ to its original direction. If its speed also changes from 20m//s to 10m//s . Find the magnitude of impulse acting on the bullet.

A bullet of mass 10^-3kg strikes an obstacle and moves at 60^@ to its original direction. If its speed also changes from 20m//s to 10m//s . Find the magnitude of impulse acting on the bullet.