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Answer:
kinetic energy
Explanation:
Light is actually a form of kinetic energy that is visible to the human eye.
Answer:
The applied force is greater than the frictional force.
Explanation:
the chair moves at <u>a constant speed</u><u> </u><u>therefore</u><u>,</u><u> </u><u>the</u><u> </u><u>answer</u><u> </u><u>is</u><u> </u><u>not</u><u> </u><u>A</u><u> </u><u>or</u><u> </u><u>C</u><u>.</u>
if there is no friction then the chair <u>would accelerate and it would not be at a constant speed</u><u>.</u>
hence, the only possible answer is B.
Answer:
160m/s
Explanation:
The speed of a wave is related to its frequency and wavelength, according to this equation:
v=f ×λ
Answer:

Explanation:
The expression for the second law of motion is given below:
h = 
<u>For first half distance</u>
Object is initially at rest, so its initial speed u = 0
Object falls at half the distance, so h = h/2 where t = t1
Hence, we have

<u>For second half distance:
</u>
Similarly,
where t = t1 + t2 and u= 0
Using equation 2 by equation 1
we obtain 
Hence 
Hence 