1. The displacement s(in metres) of a particle moving in a line starting from A at any time t (in seconds where t≧0) is given by s=t^4-4t^3+4t^2+20.
a) Find the velocity and accleration of the particle at t=1.
b) Find the maximum distancece between the particle and A witthin the time interval 0≦t≦3.
2.The surface area of a balloon is increasing at the rate of 3 cm^2s^(-1). At what rate is its volume increasing when the radius is 10cm.