Aball is thrown straight upward and rises to a maximum height of 18.0 m above its launch point. at what height above its launch point has the speed of the ball decreased to one-half of its initial value?

A ball is thrown straight upward and rises to a maximum height of 18.0 m

above its launch point. at what height above its launch point has the

speed of the ball decreased to one-half of its initial value?

kinematic equation

v^2=u^2-2as; v0=,s=18,a=-10m/s/s

u=root 360

(u/2)^2=u^2-2as

=>s=13.5m

small = small current large mag large current

grav force prop 1/r squared 2r all squared is 4rsquared 1/4rsquared quartered