# physics

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A ball is thrown vertically upward with a speed of 19.0 m/s.
(a) How high does it rise?
m

(b) How long does it take to reach its highest point?
s

(c) How long does the ball take to hit the ground after it reaches its highest point?
s

(d) What is its velocity when it returns to the level from which it started?

m/s

• physics -

a. h = (Vf^2-Vo^2)/2g.
h = (0-361)/-19.6 = 18.4 m.

b. Tr = (Vf-Vo)/g.
Tr = (0-19)/-9.8 = 1.94 s. = Rise time.

c. Tf = Tr = 1.94 s. = Fall time.
OR
0 + 4.9*t^2 = 18.4.
t^2 = 3.755
Tf = 1.94 s. = Fall time.

d. Vf = Vo + gt = 0 + 4.9*1.94=19 m/s.

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