Question
Physics Question on Work-energy theorem
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/s2. The work done by the (i) gravitational force and the (ii) resistive force of air is
A
(i) – 10 J (ii) – 8.25 J
B
(i) 1.25 J (ii) – 8.25 J
C
(i) 100 J (ii) 8.75 J
D
(i) 10 J (ii) – 8.75 J
Answer
(i) 10 J (ii) – 8.75 J
Explanation
Solution
The correct option is (D): (i) 10 J (ii) – 8.75 J.