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15 November, 14:04

You are the design engineer in charge of testing the crashworthiness of new automobile models. Cars are tested by smashing them into fixed, massive barriers at 50 km/h (30 mph). A new model of mass 1500 kg takes 0.15 s from the time of impact until it is brought to rest. Take the initial velocity of the car to be positive. (A) Calculate the average force exerted on the car by the barrier.

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  1. 15 November, 14:18
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    average force is 138900 N

    Explanation:

    given data

    speed = 50 km/h = 13.89 m/s

    mass = 1500 kg

    time = 0.15 s

    to find out

    average force

    solution

    we know initial velocity of car is positive

    we will apply here equation to find force that is

    Force x change in time that is equal to mass x change in speed ... 1

    so put here all value of mass, time and velocity in equation 1

    Force x 0.15 = 1500 x (-13.89)

    force = 138900 N

    so average force is 138900 N
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