Question

(TCO 6) A car travelling at 70 kilometers per hour hits a block wall and comes to a complete stop. If the time for the car to reach a complete stop is 450 ms and the wall does not move, how much force was exerted on the car? The mass of the car is 1500 kg.

Answer 1

F = 64800 N

Step-by-step explanation:

Given that,

Initial speed of a car, u = 70 km/h = 19.44 m/s

Finally it comes to a stop, v = 0

Time,t = 450 ms

The mass of the car is 1500 kg

We need to find the force exerted on the car. The force exerted on an object is given by :

F = ma

So,

`F=(m(v-u))/(t)\\\\F=(1500* (19.44-0))/(450* 10^(-3))\\\\F=64800\ N`

So, the required force is equal to 64800 N.