8th Class
Science
Force and Pressure
Question Bank
Force and Pressure
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\[~F=20N+15N=35N\] \[35N=m\times 2\] \[m=\frac{35}{2}=17.5kg\]