Basic Mathematics - Old Questions

2. A rock breaks loose from the top of a tall cliff             [3 + 3 + 4]

    (a) Find average speed during the first 2 sec of fall.

    (b) What is its average speed during the 1sec interval between second 1 and second 2?

    (c) Find the speed of the falling rock at t = 1 and t = 2.