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valentinak56 [21]
3 years ago
11

Which of these is an example of projectile motion?

Physics
1 answer:
Usimov [2.4K]3 years ago
8 0

Answer:

the answer is d I'm pretty sure

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In a chemical reaction, the bonds in the molecules
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Answer:

B. change

Explanation:

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If al snow and glaiers melted, would the sea level rise or fall
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A toy rocket is fired vertically into the air from the ground at an initial velocity of 80 feet per second. Find the time it wil
miskamm [114]

Answer: 16.3 seconds

Explanation: Given that the

Initial velocity U = 80 ft/s

Let's first calculate the maximum height reached by using third equation of motion.

V^2 = U^2 - 2gH

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Since the toy is moving against the gravity, g will be negative.

At maximum height, V = 0

0 = 80^2 - 2 × 9.81 × H

6400 = 19.62H

H = 6400/19.62

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Let's us second equation of motion to find time.

H = Ut - 1/2gt^2

Let assume that the ball is dropped from the maximum height. Then,

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H = 1/2gt^2

326.2 = 1/2 × 9.81 × t^2

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t^2 = 326.2/4.905

t = sqrt( 66.5 )

t = 8.15 seconds

The time it will take for the rocket to return to ground level will be 2t.

That is, 2 × 8.15 = 16.3 seconds

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3 years ago
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true

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