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# M1 suvat equations help pls!

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1. hi I have worked out T in part a but when I sub 25/9 into T it doesn't give me the right value for H . Where has it gone wrong ??? I did manage to find T using the equations.... Thanks.Attachment 543001543007
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2. (Original post by coconut64)
hi I have worked out T in part a but when I sub 25/9 into T it doesn't give me the right value for H . Where has it gone wrong ??? I did manage to find T using the equations.... Thanks.Attachment 543001543007
You've messed up the fact that A starts 50 metres above the ground. They should both be at height h, not one at height h and the other at height h + 50.

Their respective equations should be

A: h = ut - 1/2gt^2 + 50
B: h = ut - 1/2gt^2
3. (Original post by coconut64)
hi I have worked out T in part a but when I sub 25/9 into T it doesn't give me the right value for H . Where has it gone wrong ??? I did manage to find T using the equations.... Thanks.Attachment 543001543007
Not checked thoroughly, but I do notice that your "h" is the height above the projection point of A, whereas the question's "h" is the height above the ground.

Edit: Ninja'd again
4. (Original post by Zacken)
You've messed up the fact that A starts 50 metres above the ground. They should both be at height h, not one at height h and the other at height h + 50.

Their respective equations should be

A: h = ut - 1/2gt^2 + 50
B: h = ut - 1/2gt^2
Thanks.
5. (Original post by ghostwalker)
Not checked thoroughly, but I do notice that your "h" is the height above the projection point of A, whereas the question's "h" is the height above the ground.

Edit: Ninja'd again
Okay I will check it again thanks.

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