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ruslelena [56]
3 years ago
5

A ball is shot straight up from the surface of the

Physics
1 answer:
koban [17]3 years ago
3 0
A ) The displacement:
d = v o t - (gt²) / 2 = 
= 19.6 m/s × 1 s - ( 9.8 m/s² x 1 s² ) / 2 = 
= 19.6 m - 4.9 m = 14.7 m
b ) v = v o - g t
0 = 19.6 m/s - 9.8 t    ( when the ball is at the highest point )
9.8 t = 19.6
t = 19.6 : 9.8
t = 2 s
h = v o t - (gt²)/2 = 19.6 x 2 - ( 9.8 x 4 ) / 2 = 39.2 - 19.6
h = 19.6 m
c ) h = gt² / 2
19.6 = 9.8 t²/2
9.8 t² = 39.2
t² = 39.2 : 9.8
t² = 4
t 2 = 2 s   ( and we know that t 1 = 2 s )
t = t 1 + t 2 = 2 s + 2 s = 4 s 
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