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Physics moments. watch

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    Hey guys, I'm working through a past paper and I stumbled upon this question, I'm a bit stumped on how to work it out.
    A car of mass 750kg travelling at a speed of 4.0ms-1 is struck from behind by another vehicle. The impact lasts for 0.55s and causes the speed of the car to increase to 8.4ms-1. Calculate the force of the impact.

    Would be really nice if I got some help, many thanks
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    Also have these questions too,
    'A ball of mass 0.80kg is falling to Earth at a constant velocity of 30ms-1. Determine the drag on the ball and explain your reasoning by applying the appropriate law of motion'

    'A car of mass 650kg accelerates uniformly along a straight line from rest to a speed of 15ms-1 in 60s. Calculate the force on the car hay producted the acceleration'

    'A rocket of mass 750kg blasts vertically from the launch pad at an acceleration of 5.0ms-2. Calculate the thrust of the rocket engines'
 
 
 
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