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Answer:
A. 490
Explanation:
soln
mass = m = 5kg
Height = h = 10m
Acceleration due to gravity = g = 9.8ms²
K.E = 1/2 × mass × (velocity)²
Recall from equations of motion
v² = u² + 2gh
Therefore,
K.E = 1/2 × mass × ( u² + 2gh)
K.E = 1/2 × 5 × ( 0² + 2×10×9.8)
K.E = 1/2 × 5 × 196
K.E = 1/2 × 980
K.E = 490 Joules
The time of flight depends only on the initial velocity and the initial height
Explanation:
An object is said to be in free fall if the only force acting on it is the force of gravity. If this is the case, then the motion of the object in free fall is a uniformly accelerated object, with constant acceleration
towards the ground. The time of flight can be found by using the suvat equation:

where
s is the displacement (which corresponds to the initial height of the object)
u is the initial vertical velocity
is the acceleration
t is the time of flight
Therefore, from the equation, we see that the time of flight depends only on two factors:
- s, the initial height of the object
- u, its initial velocity
In case the air resistance is not negligible, then the acceleration is no longer constant, and the time of the fall also depends on other factors such as the mass of the object and its shape, which affects the magnitude of the air resistance acting on the body.
Learn more about free fall:
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Answer:
Explanation:
- Given λ = wavelength of light reflected = 635 nm
- Using the equation ; 2 nb t = (m - (1/2)λ
Plugging the values in the equation ;
- 2 (1.50) t = (1 - (1/2) (635)
- t = 105.83 nm = the minimum thickness of the film
b) To calculate the wavelength of the most reflected visible light ;
- From the equation 2 nb t = mλ
Plugging the values into the equation
- λ' = wavelength = 317.5 nm