alleryA force F acts on a 2 kg body for 3 s, changing its speed from 2 m/s to 8 m/s along the line of F. The magnitude of F is
A2 N
B12 N
C6 N
D4 N
Answer & Solution
Correct answer: D. 4 N
We have F = ma.
That is F = m·Δv/Δt.
That is F = 2·(8−2)/3.
That is F = 2·2.
So F = 4 N.
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