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Question

Two blocks of masses 5 kg and 10 kg are connected by a massless spring. A force of 20 N acts on 10 kg mass as shown. At the instant, 5 kg mass has an acceleration of 0.4ms2,the acceleration of 10 kg mass is

A
2.9ms2
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B
1.8ms2
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C
3.5ms2
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D
1 ms2
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Solution

The correct option is D 1.8ms2

let the spring force at that instant is Fsp
FBD of 5 kg
Fsp=5a1[Fnet=ma]
=5×0.4=2N
FBD of 10 kg
net force= 20-2=18 N
18=10a2a2 1.8ms2
Acceleration of 10 kg mass at the instant given is 1.8ms2


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