3 years ago

Which is NOT an example of evidence that shows a chemical reaction occurred?

Physics

1 answer:

Wittaler [7]3 years ago

4 0

Change in color
Change in color is a physical reaction

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When a ball is launched from the ground at a 45° angle to the horizontal, it falls back to the ground 50 m from the launch point

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Answer:

Explanation:

Given

angle through which ball is launched $=45^{\circ}$

Range of ball=50 m

Range of projectile is $=\frac{u^2sin2\theta }{g}$

$50=\frac{u^2sin90}{9.8}$

u=22.136 m/s

If ball is thrown straight upward

$v^2-u^2=2as$

$0-(22.136)^2=2(-9.8)s$

$s=\frac{22.136^2}{2\times 9.8}$

s=25 m

(b)For Projectile time of flight is

$t=\frac{2usin\theta }{g}$

$t=\frac{2\times 22.136\times sin45}{9.8}$

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3 years ago

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