Question

in a laboratory test a car of mass 1200 kg is driven into a concrete wall as shown in Fig. 2.1. The car is brought to rest in 0.36s when it collides with the wall. The speed of the car before the collision is 7.5m/s. Calculate the average force

Answer 1

Answer:

average force is 25000 N

Answer 2

The average force exerted on the car during the collision with the wall is 25,000 N.

To calculate the average force, we can use the formula:

average force = (mass x change in velocity) / time

The change in velocity can be calculated as the difference between the initial velocity and the final velocity, which is zero since the car is brought to rest. Therefore:

change in velocity = final velocity - initial velocity = 0 - 7.5 = -7.5 m/s

Substituting the given values into the formula, we get:

average force = (1200 kg x (-7.5 m/s)) / 0.36 s = -25,000 N

The negative sign indicates that the force is acting in the opposite direction of the car's motion.
Therefore, the average force exerted on the car during the collision with the wall is 25,000 N. This force is strong enough to cause significant damage to the car and highlights the importance of wearing seat belts and other safety measures while driving.

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