Question

A sledge of mass 25 kg is pulled across level ground with a horizontal force of 60 N. The constant force of friction is 20 N. What is the acceleration of the sledge?

• A. $0.63m/s^2$
• B. $1.6m/s^2$
• C. $2.4m/s^2$
• D. $3.2m/s^2$

Answer 1

Answer: (B)

$1.6m/s^2$

Answer is B.
The net force acting on the sledge is given as 60 N - 20 N = 40 N.
We know that, Acceleration = Force / Mass.
That is, a = 40/25 = $1.6m/s^2$.
Hence, the acceleration of the sledge is $1.6m/s^2$.