Explanation
Think of the man as a mass of 70 kg moving with the speed of the car, i-e, 20.0 m/s. So he has a momentum, mv. In case (a), it directly collides with the dashboard and comes to stop in 2.0 milliseconds. In case (b), the passenger stops in a longer time of 45 milliseconds. Clearly, in case (b) the rate of change of momentum is slower than the case (a). (Do you know what is meant by “rate of change”)?
A very good and brief explanation with easy solutions
Mahdi
Thanks for the comments.
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