Calculate the power of a crane in watts, which lifts a mass of `100 kg` to a height of `10 m` in `20 s`.

Options

A. 590 w
B. 480 w
C. 490 w
D. 600 w

Answer

C

Explanation

`{:("Given",,"mass = m = 100",,),("kg",,,,),(,,"height = h = 10 m",,),("time duration t = 20 s",,,,),(,,"power =Rate of",,),("work done",,,,):}`
=`("change of PE")/("time") = ("mgh")/(t)`
`=(100 xx 9.8 xx 10)/(20)`
`=5 xx 98 = 490 W`.