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Calculate the momentum of a 250kg object moving at \( 4.5ms^{-1}\). (All answers are in\( kgms^{-1} \) )
Calculate the weight of 700 grams
A bullet of mass 25g enters a wooden target travelling at \( 490 ms^{-1}\) and leaves it travelling at \( 180ms^{-1} \). Calculate the average force exerted by the wood on the bullet if the target was 2.5cm thick.
A body of mass 8kg moving at \( 3ms^{-1} \) to the right collides with a body of mass 6kg moving at \( 7ms^{-1} \) to the left. After the collision the velocity of the 6kg particle is reduced by \( 5ms^{-1} \) Calculate the velocity of the 8kg particle after the collision.
A spacecraft of mass 600kg travelling at \( 1ms^{-1} \) expels 10kg of exhaust gas at \( 150ms^{-1} \). What speed is it travelling after this?
A person of mass 55kg stands in a lift while it accelerates upwards at \( 2.5ms^{-2} \), what force does the floor of the lift exert on them during this acceleration?
1: A body of mass 800g travelling at \( 5ms^{-1} \) rightwards collides with a stationary 1.7kg body, they combine on impact, what is the velocity of the combination after the collison?
2: If the collision lasts 0.1s what is the average force exerted by each body during?
The metre stick below has a mass of 2N, is it in equilibirum?