A-level physics question help needed asap

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blank4567
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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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Muttley79
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(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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RogerOxon
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(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?
s=ut+\frac{at^2}{2}
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Alevelgoosegei
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S=ut-1/2*g*t^2. you will get the displacement.
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blank4567
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(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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Vinny C
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good, sure you are the best we have to offer?
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Vinny C
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(Original post by Vinny C)
good, sure you are the best we have to offer?
Done that bit.
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Hash.m
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(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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Muttley79
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(Original post by Hash.m)
How did you get this equation??
SUVAT
s = ut + 1/2 at^2
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Hash.m
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(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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Muttley79
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(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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