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As part of a safety investigation, two 1400 kg cars traveling at 20 m/s are crashed into different barriers. Find the average forces exerted on (a) the car that hits a line of water barrels and takes 1.5 s to stop, and (b) the car that hits a concrete barrier and takes 0.10 s to stop.

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MechEngineer

Answer:

(a) 18667N

(b)280000N

Explanation:

The momentum of both car prior to collision:

M = mv = 1400*20 = 28000 kgm/s

After colliding, the average force exerting on either car to kill this momentum is

(a)[tex] F_1 =\frac{M}{t_1} = \frac{28000}{1.5} = 18667N[/tex]

(b)[tex]F_2 = \frac{M}{t_2} = \frac{28000}{0.1} = 280000N[/tex]

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