A 10 kg block is attached to a light chord that is wrapped around the pulley of an electric motor. at what rate is the motor doing work when it is pulling the block upward w an instantaneous speed of 3 m/s and an upward acc of 2 m/s^2?

The rate of work is 360 W

Explanation:

Given:

Speed of block

Upward acceleration of block

Mass of block kg

First Find the force act on block due to gravity

Where

  N

For finding at what rate motor doing work when it is pulling the block upward,

  W

Therefore, the rate of work is 360 W

diagram is missing, but i will try to explain your doubt.

answer:

amplitude is the maximum displacement or distance moved on a point of a vibrating body or wave measured from its equilibrium position.it is equal to half the length of vibration path.