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While testing the safety of a car, a dum...

While testing the safety of a car, a dummy driver is used and the car is propelled at different speeds to hit a rigid wall. In one such test, the dummy driver had a mass of 70 kg and the speed of the car just before impact was `40ms^-1`. If the time interval between the collision and the car coming to rest was 0.2 s, then find the deceleration of the dummy driver due to impact.

A

`200 ms^-2`

B

`80 ms^-2`

C

`110 ms^-2`

D

`280 ms^-2`

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