Question

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Answer 1

Answer:

kinetic energy is equal to potential energy

so k.E = mgh

K.E = mgh

= 9.8×10×8

= 98×8

= 784

Explanation:

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Answer 2

Question: A body of mass 10 kg falls freely from a height 8 m. What will be its kinetic energy on reaching ground. g = 9.8 m/s²

Provided that:

• Mass = 10 kg
• Height = 8 m
• g = 9.8 m/s²

To calculate:

• Kinetic energy

Solution:

• Kinetic energy = 784 J

Using concept:

• Potential energy formula

Using formula:

• ${\small{\underline{\boxed{\pmb{\sf{E_p \: = mgh}}}}}}$

Where, E_p denotes potential energy, m denotes mass of body, g denotes acceleration due to gravity and h denotes height.

Explanation: As the body is falling freely from a height means it is moving with a kinetic energy and it is going to fall on ground, therefore, here we can use formula to find out potential energy to solve this question as here according to the condition, Kinetic energy = Potential energy.

Required solution:

${\sf{:\implies Potential \: energy \: = mgh}}$

${\sf{:\implies E_p \: = mgh}}$

${\sf{:\implies E_p \: = 10(9.8)(8)}}$

${\sf{:\implies E_p \: = 98(8)}}$

${\sf{:\implies E_p \: = 784 J}}$

${\sf{:\implies Potential \: energy \: = 784 J}}$

${\sf{\therefore \: Kinetic \: energy \: = 784 J}}$