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conservation

this is math!

So you're on calculus?

algebra

Do you have the kinematics equation given to you?
like:
x(t)=vt+(1/2)at^2

I have h(t)=-4.9t^2 + VoT +Ho

x(t)=-10
v=+27
a=-32.2
Solve for t.

That is assuming the ball was thrown vertically \(upwards\)

and reject the negative root from the quadratic equation.

okay, I understand now.

or not

I have to change it to a different question because I got a 70%

ok, anyway, the principle is the same.

with the new question, of course.