Which observational tool helped astronomers Arno Penzias and Robert Wilson discover the existence of the cosmic microwave backgr
1 answer:
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Answer:
8.2 m/s upward
Explanation:
The motion of the ball is a free fall motion, so we can use the suvat equation:
where:
v is the final velocity
u is the initial velocity
a is the acceleration
t is the time
Choosing upward as positive direction:
(acceleration of gravity)
t = 1.5 s
Solving for u, we find the initial velocity:
And the direction is upward.