CBSE Class 9 Answered
A cord is used to lower a block of mass 'M' and moves a distance 'd' with constant acceleration 'g/4'. Calculate the work done by the cord on the block.
Asked by aarya_t | 26 Feb, 2015, 10:16: PM
Expert Answer
When the block is lowered, it experiences an upward force T due to tension and the net force on the block in the downward direction reduces from Mg to Mg-T. Hence the acceleration 'a' becomes less than 'g'.
Equation of motion:
Mg - T = Ma
Given, a = g/4
T=3 Mg/4Work done by the tension,
Answered by Faiza Lambe | 27 Feb, 2015, 09:14: AM
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