Bumpers on cars are not of much use in a collision. To seewhy, calculate the ave

Question

Bumpers on cars are not of much use in a collision. To seewhy, calculate the average force a bumper would have to exert if itbrought a 1200 kg car (a so-called "compact" model) to a rest in 15cm when the car had an initial speed of 2 m/s (about 4.5 mph).Bumpers are built with springs which compress to provide a stoppingforce without (hopefully) denting the metal . Express answer in Newtons Bumpers on cars are not of much use in a collision. To seewhy, calculate the average force a bumper would have to exert if itbrought a 1200 kg car (a so-called "compact" model) to a rest in 15cm when the car had an initial speed of 2 m/s (about 4.5 mph).Bumpers are built with springs which compress to provide a stoppingforce without (hopefully) denting the metal . Express answer in Newtons

Explanation / Answer

We know that workdone = change in kinetic energy                        F . X = 0.5 mv2              ==> force F = m v2 / 2X                                   = 1200 * 2*2 / 2 * 0.15                                   = 16000 N

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