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#1. A force of 50 N moves an object by 4 m in the same direction. The work done is:
#2. A boy pushes a wall with all his strength but the wall does not move. The work done on the wall is:
#3. A force acts perpendicular to displacement. The work done is:
#4. A goalkeeper stops a moving football. The work done by the goalkeeper on the ball is:
#5. If velocity becomes three times, kinetic energy becomes:
#6. Mechanical energy is the sum of:
#7. In the absence of friction, the total mechanical energy of a freely falling body:
#8. A car moving at constant velocity has:
#9. Why are mountain roads zig-zag?
#10. A person does 600 J work in 3 s. Power developed is:
