A body of mass 2 kg moving on a horizontal surface with initial velocity of 4 m s^-1 comes to rest after two seconds.
A body of mass 2 kg moving on a horizontal surface with initial velocity of 4 m s-1 comes to rest after two seconds. If one wants to keep this body moving on the same surface with a velocity of 4 m s-1, the force required is
(A) 2 N
(B) 4 N
(C) 0
(D) 8 N
4 views
2 Answers
Correct Option is : (A) 4 N
We know that ,
v = u + at
\(0 = 4 + a \times 2\)
\(a = \frac{-4}{2}\)
\(a = -2 m/s^2\)
\(Force , \ F = ma\)
\(F = 2 \times 2\)
\(F = 4N\)
4 views
Answered