A car traveling at 20 m/s runs into a bridge abutment and crumples for 1.2 m before coming to a full stop. If we estimate the process as constant deceleration motion, what is the average force exerted on the car, which weighs 1500 kg, during the collision process

Average force exerted on car = 250,000 N or 250 KN

Explanation:

Given:

Initial speed u = 20 m/s

Final speed v = 0 m/s

Total distance covered = 1.2 m

Find:

Average force exerted on car

Computation:

v² = u² + 2as

0² = 20² + 2(a)(1.2)

a = -166.67 m/s² or 166.67 m/s²

Average force exerted on car = Ma

Average force exerted on car = (1,500)(166.67)

Average force exerted on car = 250,000 N or 250 KN

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