A constant retarding force of 50 N is applied to a body of mass 20 kg moving initially with a speed of 15 m s-1. How long does the body take to stop?
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Answer:
the answer is 2 seconds
Explanation:
F = m(-a)
a = -F/m = 50/20 = -2.5 m/s²
u = 5 m/s
v = 0
by the equation of motion,
v = u + at
0 = 5 - 2.5 t
t = 5/2.5
t = 2 sec
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