Exercise 1 At time 1, the position of a body moving along s-axis is s(1) =r-61 +91 (i) Find the velocity at t=4 (ii) Find the body acceleration each time the velocity is zero. Exercise 2 The volume of...

Exercise 1 and exercise 2

Extracted text: Exercise 1 At time 1, the position of a body moving along s-axis is s(1) =r-61 +91 (i) Find the velocity at t=4 (ii) Find the body acceleration each time the velocity is zero. Exercise 2 The volume of a cube is increasing at the rate of 1200cm3/min at the instant its edges are 20cm long. At what rate are the lengths of the edges changing at that instant?