
Given ,
initial velocity , u = 20 m/s
final velocity , v = 60 m/s
time taken = 2 seconds
Now ,

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That's the 'electrostatic' force.
Explanation:
In a collision between two objects, both objects experience forces that are equal in magnitude and opposite in direction
Full moon: All of the moon or sun appears covers by the shadow.
When the moon is waxing, it means that the lit part is getting larger (going towards a full moon)
When the moon is waning , it means that the lit part is getting smaller (going towards a new moon)
The new moon represents the start of a new lunar cycle and occurs approximately every 29 days.
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