A 2.75-kg cat moves in a straight line (the x -axis). ?Figure E4.14? shows a graph of the x -component of this cat’s velocity as a function of time. (a) Find the maximum net force on this cat. When does this force occur? (b) When is the net force on the cat equal to zero? (c) What is the net force at time 8.5 s?

Solution 14E Step 1: Mass of the cat (m) = 2.75 kg Problem (a) Step 1: The velocity increase from 0 to 8m/s during time 0 to 2s Acceleration (a ) = v u 1 t2 t1 a 1 = 20 a = 4 m/s 2 1