Question

An object of mass $2\mathrm{kg}$ is sliding with a constant velocity of $4\mathrm{m}/\mathrm{s}$ 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

Explanation for correct option:

B: 0 N -

Newtons' first law: - A body will remain at rest or in motion with the same speed and in the same direction until an unbalanced force is applied to it.

To keep a body moving at a constant speed, no force is necessary. According to Newton's first law, this is the case.

Explanation for incorrect options:

A: 32 N - As no force is required. So, this is an incorrect option.

C: 2 N - As no force is required. So, this is an incorrect option.

D: 8 N - As no force is required. So, this is an incorrect option.

Hence, option B) is the final answer.