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azamat
3 years ago
13

A tennis ball is thrown straight up into the air with an initial velocity of 38 m/s.

Physics
1 answer:
geniusboy [140]3 years ago
8 0

Answer:

a) 3.9s

b)74m

Explanation:

a) v=u+at

0=38+(-9.8)t

-38=-9.8t

t=-38/-9.8

t=3.877s

t=3.9s

b) s=ut+1/2at²

s=(38×3.9)+1/2(-9.8×3.9²)

s=148.2 -74.529

s=73.671

s=74m

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8 0
1 year ago
In still​ water, a boat averages 18 18 miles per hour. it takes the same amount of time to travel 16 miles 16 miles ​downstream,
Vladimir79 [104]
<span>The current is 6 miles per hour.
   Let's create a few equations:
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   Traveling against the current:
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   Let's multiply the 2nd equation by 2
 (18 - c)*t*2 = 16

   Now subtract the 1st equation from the equation we just doubled.
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   So the current is 6 mph.
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Effectus [21]

Answer:

97.1037936

Explanation:

?

4 0
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First write down all your known variables:

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