physics help please?

0 ⤊

physics help please?

A tennis ball is thrown vertically upward with an initial velocity of +8.0 m/s.

What will the ball's speed be when it returns to its starting point? and how long will the ball take to reach its starting?

2007-10-29 04:59:35 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Physics

3 answers

The speed of the tennis ball will be -8.0 m/s.

Why is there a negative sign? It's because of the direction.

Good luck and God bless!

2007-10-29 05:12:24 · answer #1 · answered by Anonymous · 0⤊ 0⤋

It will be the same speed...8.0 m/sec.

Assuming g = 9.8 m/secÂ², t = 2v/a = 2*8/9.8 = 1.6 sec

All answers to 2 sig figs.

2007-10-29 12:03:42 · answer #2 · answered by gebobs 6 · 0⤊ 0⤋

i believe the speed will be 10m/s but i am not sure on the time

2007-10-29 12:02:47 · answer #3 · answered by stuartelliott797 2 · 0⤊ 0⤋