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# M1 Kinematics watch

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1. Can people help? I will Rep one of the responders when i next log on!

1) A stone is catuplulted vertically upwards with a velocity of 25ms^-1 from a point 2m above the ground . Find a) the velocity when it hits the ground and b) the time it takes to reach the ground

2) Water from a fountan rises to a height of 6m by modelling the drops of water s particles . Find the speed of the water as it leaves the nozzles

Thanks all of you
2. 1)a. u=25 v=? s=-2 a=-9.81

b. s=-2 u=25 a=-9.81

3. b)

s = 6
u =
v = 0
a = -9.8
t =

v^2 = u^2 + 2as
0 = u^2 - 2*6*9.8
u^2 = 12*9.8
u = root(12*9.8)
4. 2. V^2= U^2 + 2AS V=0 as its maximum height so U^2 = 2AS as A will be - in this case. U = root ( 2 x 9.8 x 6) U = 10.84 to 2d.p. i think thats right.
5. (Original post by jameso88)
2. V^2= U^2 + 2AS V=0 as its maximum height so U^2 = 2AS as A will be - in this case. U = root ( 2 x 9.8 x 6) U = 10.84 to 2d.p. i think thats right.
Seconded
6. (Original post by jameso88)
2. V^2= U^2 + 2AS V=0 as its maximum height so U^2 = 2AS as A will be - in this case. U = root ( 2 x 9.8 x 6) U = 10.84 to 2d.p. i think thats right.
The other way is to think in terms of conservation of energy:
, which will give the same result.
7. Each to their own.

OP you should really be doing these yourself otherwise you will never learn it.

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