the velocity is the derivative of the displacement. Find the times at which the particle is stationary between t=0 and t=4 (or establish that there are none), then add up the displacements between consecutive stationary points and t=0 and t=4.a)What is the distance covered by the particle by time t = 4 ?

Speed is the magnitude of velocity. velocity is the derivative of displacement with respect to t.b)Find approximate value of time t when the speed of the particle is 84

acceleration is the derivative of velocity with respect to t.c)Find a function that describes the acceleration of this particle.

You will probably be able to do d and e when you have done c.