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Problem from relative velocity

A Boat covers certain distance between two spots in a river taking t1 hrs going downstream and t2 hrs going upstream. What time will be taken by boat to cover same distance in still water?
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Solution to HC Verma Problem

“Referring to HC Verma Part 2, chapter 29, Electric field and potential, Q 69 I think that Force is inversely proportional to square of the distance between the charged particles, so acceleration is not constant and hence v*v  =  u*u  + 2*a*s   is not valid in this case. […]

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Relative velocity in free fall

If a person jumps out of a plane, and a few seconds later, another person jumps, why is it that the difference in their velocities stays the same? Shouldn’t it decrease because eventually, the first diver will reach maximum velocity, but the other diver will be slower at first, but then he reaches max. velocity […]

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Question from Relative velocity

The distance between two cars decrease by 20m in 2s when they travel in opposite direction , and distance decrease by 1m in 1s when they travel in same direction. the speeds of cars are ………. ? (Divya posted this question)

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Relative motion in 3D (three dimension)

I wanted to ask that is there relative velocity in three dimennsion? if yes then explain it. (Apoorv Katoch asks) Answer: As we know, motion is relative. Relative velocity can be defined in three dimension also. Relative velocity is defined as the velocity of one body when the other is assumed to be at rest. […]