Question

A block of mass 15 kg is placed on a long trolley The coefficient of friction between the block and trolley is 0. 18 The trolley accelerates with 0.5 m/$s^2$ for 20 s then what is the friction force

• A. 3.5 N
• B. 133.3 N
• C. 7.5 N
• D. N.O.T

Answer 1

Answer: (C)

7.5 N

Given$;$

Mass of the block $m=15kg$

Acceleration of the trolley $a=0.5m/s^2$

As per newtons second law of motion the force on the block by the motion of the trolley is given by the relation$:$

$F=ma$

$15\times 0.5=7.5N$

Hence,

option $\left(C\right)$ is correct answer.