Question

An object of mass $2Kg$ is sliding with a constant velocity of $4\raisebox{1ex}{$m$}\!\left/ \!\raisebox{-1ex}{$s$}\right.$ on a frictionless horizontal table. The force required to keep the object moving with the same velocity is

• A. 32 N
• B. 0 N
• C. 2 N
• D. 8 N

Answer 1

The correct option is B

0 N

Step 1: Given data

Mass, $m=2kg$

Velocity, $v=4m{s}^{-1}$

As the object is moving with a constant velocity i.e., $4m{s}^{-1}$ so the acceleration of the object is zero. i.e., $a=0$

Step 2: Finding the force required to keep the object moving with the constant velocity

We know that

$$\begin{gathered} Force=m\times a \\ Bysubstitutingthegivenvaluesintheexpression,weget \\ Force=2\times 0 \\ =0N \end{gathered}$$

Hence, option B is correct.