Question

NEWTON'S LAWS OF MOTION
In the figure, the blocks A, B and C of mass m each have acceleration a, a, and a respectively. F,
and F, are external forces of magnitudes 2 mg and mg respectively.
= a, a,
OBJECTIVE PHYSICS IA​

Answer 1

Explanation:

Equation of motion for the fiven three cases are-

case A

2mg−mg=ma 1

⇒a1 =g

case B

T−mg=ma2

(where T is the tension in string)

2mg−T=2ma2

⇒a2= 3g

case C

T−mg=ma3

(where T is the tension in string)

3mg−T=ma3

⇒a3 =g

which shows that

a 1 =a3 >a 2