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Kobotan [32]
3 years ago
11

A baseball is hit with a bat and, as a result, its direction is completely reversed and its speed is doubled. If the actual cont

act with the bat lasts 0.45 s, what is the ratio of the magnitude of the average acceleration of the ball to its original speed
Mathematics
1 answer:
alexandr402 [8]3 years ago
6 0

Answer:

6.7 /s.

Step-by-step explanation:

Initial velocity = u m/s

From the question, final velocity, v = - 2u m/s

Note - (the minus sign indicates that the direction was reversed and doubled)

t = 0.45

From equation of motion,

v = u + at

Acceleration, a = (v - u)/t

= (-2u - u)/0.45

= - 3u/0.45

Acceleration, a/Original speed, u = 3/0.45

= 6.7 /s

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22,000

Step-by-step explanation:

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The combined height of one fir tree and one pine tree is 212121 meters. The height of 444 fir trees stacked on top of each other
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Answer:

Height of fir tree = 9 meters

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Step-by-step explanation:

The combined height of one fir tree and one pine tree is 21 meters. The height of 4 fir trees stacked on top of each other is 24 meters taller than one pine tree.

Let x be the height of fir tree and y be the height of pine tree

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Subtract x from both sides

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