The system shown in figure is released from rest. String is massless and pulley is smooth. Find –
A
The work done by gravity on 4 kg block in 2 second
B
The work done by string on 1 kg block in the same interval of time (Take g = 10 m/s 2 ) 
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
Work done by gravity: 
Since gravity acts in the same direction as the displacement, 
and 
:
Substitute the values:
First, find the tension T from the equation for the 1 kg block:
Work done by the string: 
Since the tension acts in the same direction as the displacement, 
and 
:
Substitute the values:
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