nadra

a particle moves along a number line measured in cm so that its position at time t sec is given by s=72/(t+2) +k, k is a constant and t>=0 seconds. (a) Find the instantaneous velocity of the particle at t=4 seconds (b) Find the acceleration of the particl...

a)v(4)=-2 seconds b)a(4).67

i don't know the answer for partc.

is answer a and b correct