f you do 600 J of work hoisting a 20 kg bale of hay, to what height did you lift it (in meters)?
You did 600J of work to change its potential energy from 0 to 600J. Potential energy is given by Ep=mgh where h is height, m is mass, and g is gravity (9.8 m/s?) so 600 = 20 * 9.8 * h = h = 3.06 meters. Doug
a 20 kg object near earth exerts 9.81 x 20 = 196.2 N. W = FxD so, W/F = D, 600/196.2 = 3.06 m. be sure to check your units.
W = F*d d = W/F d = W/Fg -----Fg is the force due to gravity d = W/(m*g) d = (600 J)/(20 kg * 9.80 m/s^2) d = 3.1 m *** You lifted the bale of hay 3.1 meters.
