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dimaraw [331]
3 years ago
11

. A tennis ball rolls off the lab bench with an initial velocity of 3.0 m/s. The top of the lab bench is 1.5 m above the floor.

How long will the tennis ball be in the air before it hits the ground
Physics
1 answer:
serg [7]3 years ago
8 0

Answer:

{ \huge{s}} = ut +  \frac{1}{2} g  {t}^{2}  \\ 1.5 = 3t +  \frac{1}{2}  \times 10\times  {t}^{2}  \\ 1.5 = 3t + 5 {t}^{2}  \\ 5 {t}^{2}  + 3t - 1.5 = 0 \\ t = 0.3 \: seconds

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Answer:

The speed of light is that medium is 281907786.2 m/s.

Explanation:

since the critical angle is Фc = 430, we know that the refractive index is given by:

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then if n is the refractive index of the medium and c is the speed of light, then the speed of light in the medium is given by:

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