Laws of Motion
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Question : 5
Total: 40
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
Solution:
Here, M = 20 k g ;
F = – 50 N
Now,F = M a
∴ a =
=
= − 2.5 m s − 2
Also,v = u + a t
Here,u = 15 m s − 1 ; v = 0
∴ 0 = 15 + ( − 2.5 ) t
ort = 6 s
Now,
Also,
Here,
or
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