How to Calculate the Power Needed to Raise a Toy Elevator?

Understanding Power and its Calculation

Power is defined as the rate at which work is done. It is measured in watts (W) and represents the amount of energy transferred or converted per unit time. In this case, we are looking to calculate the power needed to raise a toy elevator from the ground floor to the second floor in a specific amount of time.

Formula for Calculating Power

The formula used to find the power needed to raise a toy elevator is:
P = W/t
Where:
P is the power,
W is the work done, and
t is the time taken to complete the work.

Calculation for the Toy Elevator

Given that the toy elevator is raised from the ground floor to the second floor in 20 seconds using 1000 J of work, we can plug these values into the formula:
P = W/t
P = 1000 J / 20 sec
P = 50 W

Therefore, the correct power needed to raise the toy elevator is 50 watts. This means that 50 watts of power are required to lift the toy elevator from the ground floor to the second floor in 20 seconds using 1000 joules of work.