Question #a91b2
1 Answer
Oct 17, 2016
A ball is thrown upward in the air, and its height above the ground after t seconds is
Differentiating w.r.to t we get the upward velocity
So
when the ball will be traveling downward at 41.5 feet per second,then
Inserting this value in (1) we get
So the ball will be traveling downward at 41.5 feet per second after 3.89s of its projection upward from the ground.