question_answer

Rajiv pulls a wooden box from one end with a force of 20 N, and Saurabh starts pushing the same box from opposite end with a force of 15N. If a resultant acceleration of 2m/sec2 creates in the wooden box. Find the mass of the wooden box. (Hint: Resultant of the force in the same direction is addative)

A) 5kg                  

B) 70kg

C) 2.5kg                           

D) 17.5kg

Correct Answer: D

Solution :

    Since F = ma Resultant force\[~F=20N+15N=35N\] \[35N=m\times 2\] \[m=\frac{35}{2}=17.5kg\]