Explain whether a particle moving in a straight line with constant speed does or does not have an acceleration. b) Explain wheth
1 answer:
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Answer:
The speed of the rock when it is at height h/4 is .
Explanation:
At maximum height the final velocity of the rock is equal to 0. Let u is the initial velocity of the rock. Using the conservation of energy to find it as :
.......(1)
We need to find the speed of the rock when it is at height h/4. Let v' is the speed. Using 3rd equation of motion as :
here a = -g and s = h/4
Using equation (1) :
So, the speed of the rock when it is at height h/4 is . Hence, this is the required solution.