Answer:
The ball will be travelling downward with a speed of 9.8 m/s.
Explanation:
The ball will be travelling downward with a speed of 9.8 m/s.
Explanation:
The acceleration of the ball will be a constant
9.8
m
s
2
(downward), regardless of whether the ball is travelling upward or downward.
The equation that makes this calculation simplest is
v
f
=
v
i
−
g
(
Δ
t
)
where the negative sign has been used to account for the opposite directions of v
i and g
. After 3 seconds,
v
f
=
19.6
−
(
9.8
)
(
3
)
=
19.6
−
29.4
=
−
9.8
m
s
The negative result tells us that the ball is on its way downward by this time (consistent with our choice of a negative value for the downward acceleration of gravity).
