QuestionMechanics / work-energy theorem
A ball of mass 100 g falls freely from a height of h = 20 m and hits the ground at a speed of 1·4 √gh . Take g = 10 m s⁻². Which one among the following is the correct value of the work done on the ball by air friction ?
- (a) 0·4 J
- (b) 0·5 J
- (c) 0·3 J
- (d) 1 J
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