Question

A car of mass 480 kg moving at a speed of 15m/s is stopped by applying brakes in 10s. Calculate the force applied by the brakes.

Answer 1

Answer:

Mass= 480 kg

Speed or initial velocity= 15 m/s (Here speed is the initial velocity)

Final velocity= 0 (As the car is stopped then the velocity will become zero)

Time= 10 s

Force= mass × acceleration

We need to find acceleration, thus-

Acceleration= v-u/t

= (0-15/10) m/s^2

= -15/10 m/s^2

= -1.5 m/s^2 (Thus, this opposite acceleration or retardation as '-' is there)

Thus, force = m × a

= 480 kg × -1.5 m/s^2

= -720 kg m/s^2 or -720 N (as the negative force applied because of '-' sign).

Thus, force applied is -720 N

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