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DJT
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#1
Report Thread starter 16 years ago
#1
this is so annoying, not only can i not be bothered to do any coursework but the it teacher is always too busy playing his stupid games. any ideas
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username9816
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#2
Report 16 years ago
#2
(Original post by DJT)
this is so annoying, not only can i not be bothered to do any coursework but the it teacher is always too busy playing his stupid games. any ideas
Here you go:

"Tennis ball is hit so that it moves vertically downwards from a height of 1m with an initial speed of 5ms^-1. When it hits the ground it rebounds vertically with half the speed it had when it hit the ground.

Q - Find the height to which the tennis ball rebounds.
----------------------------------------------------------------------

On path to hit ground:

s = 1, u = 5, a = 9.8

v^2 = 5^2 + (2 * 9.8 * 1)
v^2 = 25 + 19.6
v = sq.root (44.6)
v = 6.68 ms^-1 (3 sf)

On way back up to reach max height:
(Remember its initial speed on way back up is then halved)

u = 3.34, a = -9.8, v = 0,

0 = (3.34)^2 + (2 * -9.8 * s)
0 = 11.1556 - 19.6s
19.6s = 11.1556
s = (11.1556)/19.6
s = 0.569 m (3.s.f.)

Therefore the ball rebounds to a height of 56.9 cm (3.s.f)
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jayrosser2004
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#3
Report 16 years ago
#3
(Original post by *reasoning*)
Here you go:

"Tennis ball is hit so that it moves vertically downwards from a height of 1m with an initial speed of 5ms^-1. When it hits the ground it rebounds vertically with half the speed it had when it hit the ground.

Q - Find the height to which the tennis ball rebounds.
----------------------------------------------------------------------

On path to hit ground:

s = 1, u = 5, a = 9.8

v^2 = 5^2 + (2 * 9.8 * 1)
v^2 = 25 + 19.6
v = sq.root (44.6)
v = 6.68 ms^-1 (3 sf)

On way back up to reach max height:
(Remember its initial speed on way back up is then halved)

u = 3.34, a = -9.8, v = 0,

0 = (3.34)^2 + (2 * -9.8 * s)
0 = 11.1556 - 19.6s
19.6s = 11.1556
s = (11.1556)/19.6
s = 0.569 m (3.s.f.)

Therefore the ball rebounds to a height of 56.9 cm (3.s.f)
what r u on about
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love_4_ducks
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#4
Report 16 years ago
#4
(Original post by jayrosser2004)
what r u on about

my thoughts exactly
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The_Barman
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#5
Report 16 years ago
#5
(Original post by jayrosser2004)
what r u on about
dont ask
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username9816
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#6
Report 16 years ago
#6
(Original post by The_Barman)
dont ask
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username9816
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#7
Report 16 years ago
#7
(Original post by jayrosser2004)
what r u on about
Only trying to help.
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