DE = DC + CE
27 = 3v - 30 + 6v - 15
27 = 9v - 45
v = 8
Answer:
frequency remains constant when light passes through different mediums . only speed changes and due to it , wavelength also changes. one way of changing the frequency is by Doppler effect, where the apparent frequency changes due to motion of the source ,observer or both of them.
Explanation:
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Newton's first law says that an object at rest will stay at rest, while an object in motion will stay in motion unless acted upon by an outside force.
A great example of this is a ball sitting on the ground. The ball will not move until some force is used on it, rather that be you kicking it, the wind blowing it, etc. Once that force is used against it, the ball will continue to move until gravity, air resistance, a friction bring it to a stop.
Average speed = (total distance) / (time to cover the distance)
Total distance = (15 x 10m) = 150 m
Time to cover the distance = 60 s
Average speed = (150m) / (60s) = (150/60) m/s = 2.5 m/s
We have no way to describe the frog's velocity, because we have
no information about the direction of any this activity.
