Question

Consider a drop of rain water having mass Ig 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 1

Work done by gravitation force is given by (W_g)

According to work energy theorem

(D) (i) 10 J 

(ii) -8.75 J