# A-level physics question help needed asap

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#1
A tennis ball is fired upwards at a speed of 60ms−1 from the top of a tall cliff. Where is it in relation to the starting point after 12.0s?
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1 year ago
#2
(Original post by blank4567)
A tennis ball is fired upwards at a speed of 60ms−1 from the top of a tall cliff. Where is it in relation to the starting point after 12.0s?
OK so what do we know ...
Taking upwards as positive
u = 60
a = -g
t = 12

Can you think of an equation that would help?
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1 year ago
#3
(Original post by blank4567)
A tennis ball is fired upwards at a speed of 60ms−1 from the top of a tall cliff. Where is it in relation to the starting point after 12.0s?
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1 year ago
#4
S=ut-1/2*g*t^2. you will get the displacement.
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#5
(Original post by Alevelgoosegei)
S=ut-1/2*g*t^2. you will get the displacement.
Thanks for the help i appreciate it!
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1 year ago
#6
good, sure you are the best we have to offer?
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1 year ago
#7
(Original post by Vinny C)
good, sure you are the best we have to offer?
Done that bit.
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1 week ago
#8
(Original post by Alevelgoosegei)
S=ut-1/2*g*t^2. you will get the displacement.
How did you get this equation??
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1 week ago
#9
(Original post by Hash.m)
How did you get this equation??
SUVAT
s = ut + 1/2 at^2
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1 week ago
#10
(Original post by Muttley79)
SUVAT
s = ut + 1/2 at^2
but the equation that worked has a minus instead of a plus?
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1 week ago
#11
(Original post by Hash.m)
but the equation that worked has a minus instead of a plus?
Yes because the object is thrown upwards and gravity is acting downwards ... read the whole thread.
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