What force will change the velocity of a body of mass 1 kg from 20 m s^-1 to 30 m s^-1 in two seconds?
What force will change the velocity of a body of mass 1 kg from 20 m s-1 to 30 m s-1 in two seconds?
(A) 1N
(B) 5 N
(C) 10 N
(D) 25 N
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2 Answers
Correct option is: (B) 5 N
We know that , Newton's second law
\(F = \frac{dp}{dt}\)
\(F = m \frac{dv}{dt}\)
\(F = 1 \times \frac{(30-20)}{2}\)
\(F = \frac{10}{2}\)
\(F = 5N\)
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