more physics help?

Question

Consider the acceleration of gravity to be
10 m=s2 :
What is the magnitude of the instantaneous
velocity (speed) of a freely falling object 18 s
after it is released from a position of rest?
Answer in units of m=s.

The answer to that is 180 m/s

how do i figure out teh avg speed?

Answer 1

The average speed over an interval is always distance/time.

In this case, you already know the time so you need to figure out the distance.

The formula for distance under constant acceleration is:

D = V0 x T + (1/2) x A x T^2

where V0 is the initial velocity and A is the acceleration.

Since you know V0, A, and T, you can compute D and then the average speed.