A car is moving along a straight line, It moves from O to P in 18 s and returns from P to Q in

6.0 s. What are the average velocity and

average speed of the car in going (a) from O to

P ? and (b) from O to P and back to Q ?

If a rock is thrown upward on the planet mars with a velocity of 10 mys, its height in meters t seconds later is given by y − 10t 2 1.86t 2 . (a) find the average velocity over the given time intervals: (i) [1, 2] (ii) [1, 1.5] (iii) [1, 1.1] (iv) [1, 1.01] (v) [1, 1.001] (b) estimate the instantaneous velocity when t − 1.