Consider a drop of rain water having mass 1 g falling from a height of 1 km. It hits the ground with a speed of 50 m/s. Take 'g' constant with a value 10 m/s 2 . The work done by the (i) gravitational force and the (ii) resistive force of air is:
Text Solution
Verified by ExpertsThe correct answer is:
D
w g = mgh = 10 –3 × 10 × 10 3 = 10 J
w all = 
KE = 
× 10 –3 × 50 × 50 = 
= 1.25 J
w g + w R
w R = – 10 + 1.25 J = – 8.75 J
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