An initially
stationary crate in is pulled, via a cable, a distance L = 5.70 m
up a frictionless
ramp, to a height h of 2.50 m where it stops.
a) How much work Wg is done on the crate
by the gravitational force Fg during the lift?
b) How much work WT is done on the crate
by the force T from the cable during the lift?
Wg = mgd cos (θ+90) = - mg d sin θ = - mgh
= -368 J
Δ K
= Wnet
= WT + Wg + WN
0 = WT + Wg + 0 → WT = - Wg
WT = 368 J