A car that weighs 1.4 × 104 N is initially moving at a speed of 35 km/h when the

Question

A car that weighs 1.4 × 104 N is initially moving at a speed of 35 km/h when the brakes are applied and the car is brought to a stop in 18 m. Assuming that the force that stops the car is constant, find (a) the magnitude of that force and (b) the time required for the change in speed. If the initial speed is doubled, and the car experiences the same force during the braking, by what factors are (c) the stopping distance and (d) the stopping time multiplied? (There could be a lesson here about the danger of driving at high speeds.) Units N (a) Number T 3757.22 (b) Numbe 13.70 (c) Number TT 72 (d) Number 5.4 Units s UnitsT m Un

Explanation / Answer

c) and d) asks the factor of distance and time required to stop are changed

as velocity is double kinetic energy is 4 times
so distance required will be 4 times and time required will be 2 times  

c) 4

d) 2

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