A ball is projected upward at time t = 0 s,from a point on a flat roof 90 m above the ground.The ball rises and then falls with insignificant air resistance,missing the roof,and strikes the ground.The initial velocity of the ball is
Consider all quantities as positive in the upward direction.The vertical velocity of the ball when it is
Above the ground is closest to
A)-81 m/s.
B)-64 m/s.
C)-48 m/s.
D)-32 m/s.
E)-97 m/s.

Question

A ball is projected upward at time t = 0 s,from a point on a flat roof 90 m above the ground.The ball rises and then falls with insignificant air resistance,missing the roof,and strikes the ground.The initial velocity of the ball is 
Consider all quantities as positive in the upward direction.The vertical velocity of the ball when it is 
Above the ground is closest to
A)-81 m/s. 
B)-64 m/s. 
C)-48 m/s. 
D)-32 m/s. 
E)-97 m/s.

Quizplus · Accepted Answer

The Answer of A ball is projected upward at time t = 0 s,from a point on a flat roof 90 m above the ground.The ball rises and then falls with insignificant air resistance,missing the roof,and strikes the ground.The initial velocity of the ball is 
Consider all quantities as positive in the upward direction.The vertical velocity of the ball when it is 
Above the ground is closest to
A)-81 m/s. 
B)-64 m/s. 
C)-48 m/s. 
D)-32 m/s. 
E)-97 m/s.

A Ball Is Projected Upward at Time T = 0