# physical science

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A tennis ball is thrown vertically upward wih an initial velocity of 8.0m/s.
A) What will its speed be wheen it returns to its tarting point?
B) How long will it take for it to reach its starting poing?

• physical science -

(A)Speed = 8m/s
(B)u=8m/s
v=0m/s
a=g=9.8m/s2
Use
v=u-gt
0=8-9.8t
9.8t=8
t=8/9.8
But this is the time required by the tennis ball to reach the highest point.
=2*8/9.8
=8/4.9
=1.632s

• physical science -

A volleyball is thrown vertically upward with an initial velocity of 7.5 m/s.
A.What will its speed be when it return to ita starting point?
B.How long will it take for it to reach its maximum height?

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