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b. A swimmer's speed along the river (downstream) is 20 km/hr. and
can swim upstream at 8 km/hr. find velocity of stream and swimmers
possible speed in still water.
c. Can you have a zero velocity but non zero acceleration?
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Answer :

GinnyAnswer

Final answer:

Calculate swimmer's speed in still water and velocity of stream. Understand the possibility of zero velocity with non-zero acceleration.


Explanation:

Swimmer's speed in still water can be calculated using the formula:

Velocity of swimmer in still water = (Speed downstream + Speed upstream) / 2

Velocity of stream can be found by calculating half the difference between downstream and upstream speeds. In this case, (20 km/hr - 8 km/hr) / 2 = 6 km/hr.

Zero velocity with non-zero acceleration is possible. An example is when an object is thrown upwards, momentarily stops at its highest point (zero velocity), and then accelerates downwards due to gravity.


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