Question

A ball is thrown straight upwards into the air with an
initial velocity of 20 m s-1. How long will it take the ball
to reach a height of 15 m? How fast will it then be
going? (Take: g = 10 m s-2)
​

Answer 1

Answer:

Step-by-step explanation:

(i)

v

2

=u

2

+2as

0=49

2

−2(9.8)(s)

s=122.5 m/s

(ii)

v=u+at

0=49−9.8t

t=5 s

total time=10 s