Help!! Differentiation find maximum height Watch

iamspiderman
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rayquaza17
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(Original post by iamspiderman)
A ball is thrown upwards. It's height at time t seconds is given by h=25t -5t^2. Find the maximum height that the ball reaches.

:confused:
What do you get if you differentiate height (displacement)?

What is the ball's velocity at the maximum height?
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Placeboo123
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(Original post by iamspiderman)
A ball is thrown upwards. It's height at time t seconds is given by h=25t -5t^2. Find the maximum height that the ball reaches.

:confused:
Differentiate once.
Put equal to zero.
Sub those values into displacement formula.
Check which is furthest.
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rayquaza17
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(Original post by Placeboo123)
Differentiate twice.
Put equal to zero.
I don't think this is right.
Acceleration at the top should be equal to 9.8.
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davros
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(Original post by iamspiderman)
A ball is thrown upwards. It's height at time t seconds is given by h=25t -5t^2. Find the maximum height that the ball reaches.

:confused:
Are you expected to use differentiation for this? You could also answer the question by completing the square
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