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Standard IX
Physics
Derivation of Velocity-Time Relation by Graphical Method
A catapult th...
Question
A catapult throws a stone of mass 0.10 kg with a velocity of 30 m/s. If 25% of the PE of the elastic band is wasted during transmission ,find the magnitude of PE.
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Solution
Given
The mass of stone(m)=
0.1
k
g
Velocity of the stone(v)=
30
m
/
s
As you know, the kinetic energy of the stone
(
K
E
)
=
0.5
m
v
2
=
0.5
×
0.1
×
(
30
)
2
=
45
J
The kinetic energy of stone=
25
than the potential energyof the catapult
That is ,KE(stone)=
75
PE(catapult)
45
J
=
0.75
×
P
E
Therefore,
P
E
=
45
0.75
=
60
J
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