A. Calculate the force needed to bring a 840–kg car to rest from a speed of 101.

Question

A. Calculate the force needed to bring a 840–kg car to rest from a speed of 101.0 km/h in a distance of 134 m (a fairly typical distance for a non-panic stop).

Calculate the force needed to bring a 840-kg car to rest from a speed of 101.0 km/h in a distance of 134 m (a fairly typical distance for a non-panic stop). Suppose instead the car hits a concrete abutment at full speed and is brought to a stop in 1.92 m. Calculate the force exerted on the car and compare it with the force found in part (a). Force Ratio

Explanation / Answer

step;1

Given that

mass m=840 kg

speed v=101 km/h=28.1 m/s

distance s=134 m

step;2

now we find the force

the force F=m(v^2/2s)=840*28.1^2/2*134

=2474.9 N

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