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Calculate the mass of a body whose kinetic energy is 72 joules and its speed is 3 m/s
I/2 x mass = 72/ 9 = 8 , Mass = 8 / (1/2 ) = 16 Kg
As doubling the speed , The kinetic energy( - increases to double -decreases to double - increases to 4 times- decreases 4times- constant - increases 3times)))
Increases to 4 times. because, K.E = 1/2 x m x speed power 2
As doubling height..................................
Potential energy increases to double value
Chemical energy stored in ..................................
car battery.
An object of mass of 2Kg is moving at a speed of 4m/sec has a kinetic energy =.........
Kinetic energy = 1/2 x mass x speed 2 = 1/2 x 2 x 16 = 16
An object of 20N weight is placed at 5m height , it has potential energy ........................
Potential = weight x height = 20 x 5 = 100 Joules.
Mechanical energy is the sum of .........energies.( potential and heat - potential and kinetic - potential and light - light and kinetic)
Potential and kinetic
………. energy is the energy stored in object due to its height or its position.(petrol - nuclear reactions - sun - coal)
Sun
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