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3 years ago

8

A car speeds up as it rolls down a hill. Which is this an example of? A. positive acceleration B. negative acceleration C. relat

ive velocity

1 answer:

alina1380 [7]3 years ago

4 0

I believe it is A. positive acceleration since it is speeding up

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3 years ago

With what minimum speed must you toss a 200 g ball straight up to just touch the 12-m-high roof of the gymnasium if you release

masha68 [24]

Answer:

v = 14.41 m/s

Explanation:

It is given that,

mass of the ball, m = 200 g = 0.2 kg

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Let v is the minimum speed with which the ball is tossed. Using the conservation of energy to find it as :

$E_p=E_k$

$mg(h-h')=\dfrac{1}{2}mv^2$

$g(h-h')=\dfrac{1}{2}v^2$

$v=\sqrt{2g(h-h')}$

$v=\sqrt{2\times 9.8(12-1.4)}$

v = 14.41 m/s

So, the minimum speed with which the ball is thrown straight up is 14.41 m/s. Hence, this is the required solution.

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2 years ago