Alessandra jumps on a trampoline. It takes her 1 second to
1 answer:
Answer:
The speed of Alessandra's motion is 2 ft/s up.
(C) is correct option.
Explanation:
Given that,
Time = 1 sec
Height = 2 feet
We need to calculate the speed of Alessandra's motion
Using formula of speed
Where, v = speed
d = height
t = time
Put the value into the formula
The direction will be up ward.
Hence, The speed of Alessandra's motion is 2 ft/s up.
(C) is correct option.
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Answer:
Explanation:
The frequency of a light is inversely proportional to its wavelength. It is given by:
The speed of the red light, v = 3.0 × 10⁸ m/s
The wavelength of the red light, λ = 690 nm = 690 ×10⁻⁹ m
Thus, the frequency of red light emitted by neon sign having wavelength 690 nm is