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in Physics by (49.4k points)

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. How long does the body take to stop?

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Best answer

Given F = – 50 N (retarding force)

m = 20 kg

u = 15 m/s. V = 0 m/s

t = ?

F = ma 

⇒ a =  \(\frac {F}{m} =\frac {-50}{20}\)

= – 2.5m/s2

but we know that

V = u + at

0 = 15 + (- 2.5) t

⇒ t = 6 s.

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