2) PHYSICS QUESTION?

Question

paula threw a ball vertically upward from the ground. The ball returned to the ground in 4 sec.

a) find the maximum height it reached the ground

b) find what velocity was it thrown

Answer 1

Let g be the acceleration due to gravity.

(b)

The speed at the highest point is 0.

If t is the time of upward flight:

0 = u - gt

u = 9.81 * 2

= 19.6 m/s.

(a)

At the highest point:

0^2 = u^2 - 2gh

h = u^2 / (2g)

= 19.6^2 / (2 * 9.81)

= 19.6 m.