Question

The answer that I get is 80 kg, but what answer key says is the answer is 5 kg. Solve please.

Answer 1

Here, it is given F(force) = 10N
u(initial velocity)= 20 m/s
v(final velocity) = 0 [ since the object have to be stopped]
mass = 2.5 kg
t(time taken) = t

°.° F= mass ×acceleration
F= mass × (v-u)/t
10= 2.5× (0-20)/t
10 = 25/10× -20/t
10= -500/10t
10×10t= -500
100t = -500
t = 5seconds




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