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The masses of 10kig and 20kg respectivel...

The masses of `10kig` and `20kg` respectively are connected by a massless spring as shown in figure. A force of `200N` acts on the `20kg` mass. At the instant shown, the `10kg` mass has acceleration `12m//sec^(2)` . What is the acceleration of `20kg` mass?

A

`12(m)/(sec^2)`

B

`4(m)/(sec^2)`

C

`10(m)/(sec^2)`

D

zero

Text Solution

Verified by Experts

The correct Answer is:
B
As the mass of 10 kg has acceleration `12(m)/(s^2)` therefore it apply 120N force on mass 20 kg in a backward direction.
Net forward force on 20 kg mass`=200-120=80N`
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