Question

Assuming the constant frictional force on sled is $150N$ , find the new acceleration when someone pulls the $50kg$ sled with a force of $400N$.

• A. $1m/s^2$
• B. $2m/s^2$
• C. $5m/s^2$
• D. $5.5m/s^2$
• E. $11m/s^2$

Answer 1

Answer: (C)

$5m/s^2$

Given : Frictional force $f=150$ N (in backward direction)

Applied force $F=400$ N (in forward direction)

$\therefore$ New acceleration of the sled $a=\frac{F-f}{m}=\frac{400-150}{50}=5$ $m/s^2$