13. A car of mass 480 kg moving at a speed of 54 km h is stopped by applying brakes in 10 s. Calculate the force applied by the brakes.
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Answer:
F= -720N
Explanation:
Data:
Vi= 54km/h = 15m/s
Vf= Om/s
t= 10sec
M=480Kg
a=?
F=?
Sol:
USING EQ,
Vf= Vi+ at
0 = 15+a (10)
-15 =10a
a= -15/10
a = -3/2
a = -1.5m/s²
F=ma
F=480×(-1.5)
F= -720N
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