A boat motor propels a boat with a force of 7.4 x 103N at an avg. speed of 20. m/s. What is the power developed by the motor?

.                  .

.                   .

Explanation:

£u€k ¥oÜ

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

read more on -

and 1and 1