Aparticle is moving along the x-axis so that its position at any time t is greater than and equal to 0 is given by x(t)=2te^-t?
a) find v(t).
b) find a(t).
c) at t=0, is the particle slowing down or speeding up? explain.
d) at what time(s), if any, does the particle change directions? justify your answer.
any would be greatly appreciated! !

Now that the first three steps have been explained, identify the next three steps, in order. calculate the magnitude of r sum vector components calculate a and b magnitudes calculate the direction of r, calculate x,y components step 4 step 5 step 6

Global warming will produce rising sea levels partly due to melting ice caps but also due to the expansion of water as average ocean temperatures rise. to get some idea of the size of this effect, calculate the change in length of a column of water 1.00 km high for a temperature increase of 1.00ºc. note that this calculation is only approximate because ocean warming is not uniform with depth. (answer in ×10^{-3} −3 m)

If the spring constant k of a pogo stick is 3500 n m and the weight of the person on the pogo stick is 700 n, how much is the spring in the botom of the pogo stick compressed?