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3 years ago

7

A negative acceleration means that the speed of the object decreases. What makes this sentene incorrect?

2 answers:

meriva3 years ago

6 0

Negative acceleration can be in two ways. It can be that the object is slowing down or it is accelerating towards another direction. The statement can be correct and wrong. Displacement is also very important whether or not the object is slowing down or moving faster

Sophie [7]3 years ago

4 0

It's not the speed , it's the rate of change of the speed decreases

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Answer:

u = 104.68 m/s

Explanation:

given,

horizontal distance = 150 m

elevation of 12.4 m

angle = 8.6°

horizontal motion = x = u cos θ. t .............(1)

vertical motion =

$y = u sin \theta - \dfrac{1}{2}gt^2$ ................(2)

from equation(1) and (2)

$y = x tan \theta - \dfrac{gx^2}{2u^2cos^2\theta}$ ..........{3}

$12.4 = 150\times tan (8.6) - \dfrac{9.8\times 150^2}{2u^2cos^2(8.6)}$

$\dfrac{9.8\times 150^2}{2u^2cos^2(8.6)} = 10.29$

$\dfrac{9.8\times 150^2}{2\times 10.29\times cos^2(8.6)} = u^2$

$u = \sqrt{10959.34}$

u = 104.68 m/s

The initial speed of the ball is u = 104.68 m/s

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2 years ago

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antoniya [11.8K]

A = d/t
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kenny6666 [7]

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Explanation:

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