Posted by **Jennifer** on Friday, June 15, 2012 at 8:41pm.

The equation for the displacement in meters of an object moving in SHM is x(t) = 1.50 cos (4.20t) where t is in seconds. (a) What is the maximum speed of the object? (b) At what time does it first reach the maximum speed?

I already got 6.3m/s for A and I got B wrong. I thought it was 1.12 s

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