Any ideas?

[strugglin-physics]

The position of a mass m = 24 kg is given (in m) by x(t) = 7sin(5t). Calculate the magnitude of the maximum force acting on the mass.

All I know is that double prime equals acceleration, but I'm not even sure it that will help me solve the problem.

Anyone have any suggestions?

[BLaH!]

Right...x'' is acceleration. And from that F = ma = mx''. All you have to do is find at what time(s) x'' is at its maximum value. Hint: The maximum value of sin t or cos t is 1.

[strugglin-physics]

I got x'' to equal -.053308sin(5t) then at maximum height t equals 54, but y doesn't equal 1.

What did I do wrong?