3 years ago

5.

1 answer:

8 0

Answer: black

Explanation: When green light is shone on a red object, it absorbs all of the green light and not reflecting anything. Hence, it appears black.

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Find the relation, time velocity graph : acceleration of an object, time position graph : ?

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17. What speed must you toss a ball straight up so it takes 4 s to return to you? Be sure to show all work to support your answe

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If we tossed up a coin with some velocity then its acceleration in the air is due to gravity which we can take as a = - 9.8 m/s^2

Also it is given that coin returns to initial position after 4 s

So after 4 s its displacement will become ZERO

now in this process we can say that in whole motion of the coin the net displacement of coin is zero and its acceleration is due to gravity remains constant.

We can use kinematics here

$\Delta y = v_i t + \frac{1}{2} at^2$

$0 = v_i (4) - \frac{1}{2}(9.8)(4)^2$

$v_i = 19.6 m/s$

so approximate speed of the coin must be nearly 20 m/s

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