A car moving at 40 km/h is to be stopped by applying
brakes in the next 4:0 m. If the car weighs 2000 kg,
what average force must be applied on it ?
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Answer:
Ans : Since car moving at speed 40km/h with mass = 2000kg its kinetic energy is 123456.7901234568 joule . its displacement is given which is 4 m . Force is = Energy/displacement. = 30864.1975308642 N .
Ans2: Given initial velocity = 100/9 m/s . Displacent is 4.0m and final velocity is 0 ( since body have to stop at last. )
using formula V2 = u2 + 2as acceleration is equal to -15.4320987654321m/s2 . Mass is 2000kg using formula F=ma force = -30864.1975308642N Which indicate that force is applying in opposite direction of motion of car.
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