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# SUVAT watch

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1. A paricle P is projected vertically upwards from a point A with speed 21ms^-1. the point A is 17.5m above horizontal ground. the particale P moves freely under gravity until it reaches the ground with a speed of 28ms^-1. After time t seconds after projection, P is 19m above A Find the possible values of t.
2. (Original post by thefatone)
A paricle P is projected vertically upwards from a point A with speed 21ms^-1. the point A is 17.5m above horizontal ground. the particale P moves freely under gravity until it reaches the ground with a speed of 28ms^-1. After time t seconds after projection, P is 19m above A Find the possible values of t.
http://www.thestudentroom.co.uk/forumdisplay.php?f=38
3. did i not post this in the maths section?
4. (Original post by thefatone)
did i not post this in the maths section?
you will get better response in Maths I think
5. (Original post by TeeEm)
you will get better response in Maths I think
oh okay
6. (Original post by thefatone)
A paricle P is projected vertically upwards from a point A with speed 21ms^-1. the point A is 17.5m above horizontal ground. the particale P moves freely under gravity until it reaches the ground with a speed of 28ms^-1. After time t seconds after projection, P is 19m above A Find the possible values of t.
How far have you got?

Draw a sketch of the motion and choose a direction to be +ve [either up or down].

Then write down the vlues you know:

u =
v =
a =

etc.

7. (Original post by Muttley79)
How far have you got?

Draw a sketch of the motion and choose a direction to be +ve [either up or down].

Then write down the vlues you know:

u =
v =
a =

etc.

oops i forgot to use a -.- well then looks like i screwed up
8. Vertical displacement, s, will be 19
U is 21ms^-1
a=-g (since we're taking upwards as positive)
t=T
Form quadratic in T and solve.

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Updated: February 14, 2016
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