posted by Sierra .
A rock of mass 0.086 kg is thrown upward with an initial speed of 13 m/s. Find the work done by gravity on the rock from the time it leaves the thrower's hand until it reaches the highest point on its trajectory. Hint: You do not have to calculate the rock's maximum height.
KE2-KE1=0-mvₒ²/2= - 0.086•13²/2=...