The position of a 45 g oscillating mass is given by x(t)=(2.0cm)cos(10t), where t is in seconds. determine the velocity at t=0.40s. express your answer in meters per second to two significant figures.

The position of the oscillating mass, in meters, is


its velocity is the derivative of the position:

since the derivative of the cosine is -sine.

Therefore, to find the velocity of the oscillating mass at time t=0.40 s, we can substitute this value into the expression of the velocity:

Sorry but what image

B, if it was a lower watt she could put it in for her normal time and not burn it