The taken by a force of 10N to stop a mass of 2.5kg which is moving at 20m/s is –
a. 0.5 s, b. 5 s, c. 50 s, d. 0.05 s.
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Verified answer
Hi there !Force = F = 10 N
Mass = m = 2.5 kg
Initial velocity = u = 20 m/s
Final velocity = v = 0 [ coming to rest ]
F = ma
a = F /m
= 10/2.5
= 4 m/s^2
Equation of motion :-
v = u + at
0 = 20 + 4t
4t = 20
t = 20/4
t = 5 sec