Physics - W.E.P. Question with Solution | TestHub
Comprehension : (3 questions)
In a second ODI match between England and India Bhuwnesh kumar bowled his medium fast bowling. He starts his run up from the distance of 50 m from the stumps (bowling end) and at the time of bowling a ball, his speed is 36 km/hr and the speed of ball is 144 km/hr. If his mass is 70 kg and mass of the ball is kg and the heat produce in his body is one tenth of the total work done by him, then
Select the incorrect statement :
Options:
Answer:
Solution:
During the run-up the bowler accelerates forward, so the ground's friction on him points forward, along his displacement: friction does positive work on him. Statement A says negative, so A is the incorrect statement.
The ball pushes back on his hand opposite his motion (B true); the ground's normal is perpendicular to his motion, so it does zero work (C true); he pushes the ball along its acceleration (D true).
Ans. (A)
