1.a 650-kg elevator starts from rest. it moves upward for3 s with constant acceleration until it reaches its cruising speed, 1.75 m/s. (a) what is the average power of the elevator motor during this period? (b) how does this compare with its power during an upward cruise with constant speed?

a) 5908.02 W

b) 5250.855 W

Explanation:

Change in Kinetic energy

Work

Power

Power is 5908.02 W

At cruising speed

The power is 11158.875 W

Difference in power is 11158.875-5908.02 = 5250.855 W

the results is a decrease in air temperature with an increase of altitude.

explanation:

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

speed = 20/2 = 10 m/s