A test car with a dummy driver of mass 60 kg was propelled towards a rigid wall. If the speed of the dummy driver just before impact was 40m/s and the time between the collision and the dummy coming to the rest was 0.10 s, calculate: (i) the average retardation of the dummy driver during impact and (ii) the average force acting on the dummy driver due to the impact.

Answer 1

This will be solved like this
i part
A=v-u÷0.10
A=0-40÷0.10
A=-40÷0.10
A=-400m/s²
ii part
Force = mass × acceleration
F=60×400
F=24KN