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2015-11-08T21:05:08+05:30

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Let initial velocity = u m/s
time taken to rise to highest point = t second
final velocity at highest point = 0
g = -9.8 m/s²
distance travelled = 19.6 m

d = (v² - u²)/2a
⇒ 19.6 = (0 - u²)/2×(-9.8)
⇒ 19.6 = u²/19.6
⇒ u² = 19.6×19.6
⇒ u = 19.6 m/s

v = u+at
⇒ 0 = 19.6 - 9.8t
⇒ 9.8t = 19.6
⇒ t = 19.6/9.8
⇒ t = 2s

Initial velocity = 19.6 m/s
time taken to reach highest point = 2s
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2015-11-08T21:11:57+05:30

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
H = 19.6 m

g = - 9.8 m/s²

Since it has to reach at the highest poing where v = 0 ,

using ,

v²-u² = -2gh
b
u² = 2gh

u² = 2gh = 2×9.8×19.6

u = 19.6m/s

Since , also ,

v = u+gt

0 = -3+a 9.8 ×t

t = 19.6/9.8

t = 2 s
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