Question

When an object falls freely, the formula for the distance it falls is d= 4.9t^2 where d is

the distance, in metres, and t is time, in seconds.

a) After 5 seconds, how far does an object fall, in metres?

b) How many seconds does it take to fall 490 m?

Answer 1

a) 122.5 meters

b) 10 seconds

Explanation:

Answer 2

a) 122.5 m ; b) 10 s

Explanation:

Just use the given equation and plug in what you know.

a)

d = 4.9t^2

d = 4.9(5^2)

d = 4.9 * 25

d = 122.5 m

b)

d = 4.9t^2

490 = 4.9t^2

100 = t^2

t = 10 s