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a) A boy throws a tennis ball vertically upwards from a truck moving at a constant velocity. Give the reason why the ball lands back exactly the same point where it was projected.
b) Define impulse in terms of momentum.
c) A trailer of mass 30 tonnes travelling at a velocity of 72km/h rams onto a stationary bus of mass10 tonnes.
The impact takes 0.5 seconds before the two vehicles move off together at a constant velocity for 15 seconds.
i).The common velocity
ii) The distance moved after the impact
iii) The impulsive force on the trailer on impact
d) Give reasons why a safety seat belt used in a vehicle:
i) Should have a wide surface area
ii) Should be slightly extensible