How much work does it take to raise a #4 kg # weight #9 m #?

1 Answer
Jan 13, 2016

Answer:

Work = force #*# distance

Explanation:

The force required to lift a 4 kg mass is it's weight, #F_g#, where

#F_g= m*g#, and #g# is the gravitational field strength, 9.8 N/kg

so

#W = F*d#
#W= m*g*d#
#W= 4kg*9.8N/(kg)*9m#

Note that some texts use 9.81 for #g#, and others suggest rounding up to 10 to simplify for purposes of focusing on conceptual principles, rather than calculation.