2. A stone of mass 500 g is thrown vertically upwards
with a velocity of 15 m sł. Calculate : (a) the
potential energy at the greatest height, (b) the kinetic
energy on reaching the ground, and (c) the total
energy at its half way point.
Ans. (a) 56-25 J (b) 56.25 J (c) 56-25 J
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11th
Physics
Work, Energy and Power
Energy Conversions
A stone of mass 500g is thr...
PHYSICS
A stone of mass 500g is thrown vertically upwards with a velocity of 15ms−1. Calculate the potential energy at the greatest height.
A
5625J
B
113J
C
56.25J
D
0J
MEDIUM
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ANSWER
Kinetic Energy, K.E=0.5×m×v2
K.E=0.5×0.5×15×15=56.25J
As it has 56.25 J at the initial point as total energy, at some point X,Potential Energy(P.E.) is maximum.
Total energy=P.E.+K.E.
56.25=P.E.+K.E.
As energy is conserved total energy at point X also must be 40 J.
For P.E to be maximum K.E. must be zero.
Hence P.E.=56.25J
We can come to the conclusion that potential energy will have the maximum value at maximum height.
Explanation:
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