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Is there a multiple choice?
Answer:
The velocity of a ball will be "-70.13 m/s".
Explanation:
The given values are:
u = 70 m
t = 0.0 s
g = a = -9.8 m/s²
s = -1 m
v = ?
As we know,
The equation of motion will be:
⇒ ![v^2-u^2=2as](https://tex.z-dn.net/?f=v%5E2-u%5E2%3D2as)
On substituting the estimated values, we get
⇒ ![v^2-(70)^2=2\times (-9.8)\times (-1)](https://tex.z-dn.net/?f=v%5E2-%2870%29%5E2%3D2%5Ctimes%20%28-9.8%29%5Ctimes%20%28-1%29)
⇒ ![v^2-4900=19.6](https://tex.z-dn.net/?f=v%5E2-4900%3D19.6)
⇒ ![v^2=19.6+4900](https://tex.z-dn.net/?f=v%5E2%3D19.6%2B4900)
⇒ ![v^2=4919.6](https://tex.z-dn.net/?f=v%5E2%3D4919.6)
⇒ ![v=\sqrt{4919.6}](https://tex.z-dn.net/?f=v%3D%5Csqrt%7B4919.6%7D)
⇒ ![v=70.13 \ m/s](https://tex.z-dn.net/?f=v%3D70.13%20%5C%20m%2Fs)
In downward direction, it will be:
⇒ ![v=-70.13 \ m/s](https://tex.z-dn.net/?f=v%3D-70.13%20%5C%20m%2Fs)
Answer:
a. blue light
Explanation: hope this helps :)