Question

A rock is dropped from a height of 88.6 m and falls toward Earth in a straight line. In t seconds the rock falls 4.9t2 meters.

Answer 1

The average speed is 9.8 meter per second in the first two seconds

Explanation:

Complete Question

What is the average velocity of the rock in first 2 secs?

Solution

Distance travelled in first two seconds

`4.9 t^2 = 4.9*2*2 = 19.6` m

Average speed =
`S2-S1/2 = 19.6-0/2 = 9.8` meter per second