A161-kg block is pulled at a constant speed of 7.40 m/s across a horizontal floor by an applied force of 138 n directed 36° above the horizontal. what is the rate at which the force does work on the block?

510.6 W

Explanation:

The rate at which the force does work is called power therefore it is given by:

The instantaneous power applied on a rigid solid is given by the product of the constant force applied over the solid's velocity.

Here is the angle between the force and the velocity.

what is the speed of a softball that travels 20m in 2secs

speed = 20/2 = 10 m/s

total distance/total time

(85 + 82)/(5+3)

167/8

20 just over