A student connects a 1 hp motor to a bicycle. How much time will it take for the bicycle to accelerate from rest to a speed of 5.0 m/s if the combined mass of the student and the bicycle is 120 kg? (1 hp = 746 W)

t=2s

Explanation:

The definition of power is:

And the work-energy theorem states that:

Since the movement starts from rest, we have that:

And putting all together:

Since we want the time taken:

Which for our values is:

time = 2s

Explanation:

Power is:

work-energy theorem states that:

Since the movement starts from rest, we have that:

And putting all together:

the time taken:

Which for our values is:

the answer should be in the picture.