Question

an object of mass 10 kg is dropped from a height of 20m . calculate the potential energy and kinetic energy of the object at various height as mentioned in the data:(take g=10m/s square) Height are 20m . 15m. 10m. 5m. and then just above the ground.​

Answer 1

Answer:

P.E at 20m = 2000 J

P.E at 15m = 1500 J

P.E at 10m = 1000 J

P.E at 5m = 500 J

P.E at 0m = 0 J

K.E at 20m = 0 J

K.E at 15m = 500 J

K.E at 10m = 1000 J

K.E at 5m = 1500 J

K.E at 0m = 2000 J

Explanation:

Check in attachment

Answer 2

The potential energy at 20 m is 1960 J,

The kinetic energy at the ground is 1960 J.

The potential energy at 15 m is 1470 J,

The kinetic energy at the ground is 1470 J.

The potential energy at 10 m is 980 J,

The kinetic energy at the ground is 980 J.

The potential energy at 5 m is 490 J,

The kinetic energy at the ground is 490 J.

Explanation:

Given that,

Mass of object = 10 Kg

Height = 20 m

(I). We need to calculate the potential energy

Using formula of potential energy

$P.E=mgh$

Where, m = mass

g = acceleration due to gravity

h = height

Put the value into the formula

$P.E=10\times9.8\times20$

$P.E=1960\ J$

The potential energy is 1960 J,

The kinetic energy at height is zero and at the ground the potential energy convert into kinetic energy. (as per the conservation of energy)

So, The kinetic energy at the ground is 1960 J.

(II). We need to calculate the potential energy at 15 m

Using formula of potential energy again

$P.E=10\times9.8\times15$

$P.E=1470\ J$

The kinetic energy at the ground is 1470 J.

(III). We need to calculate the potential energy at 10 m

Using formula of potential energy again

$P.E=10\times9.8\times10$

$P.E=980\ J$

The kinetic energy at the ground is 980 J.

(IV). We need to calculate the potential energy at 5 m

Using formula of potential energy again

$P.E=10\times9.8\times5$

$P.E=490\ J$

The kinetic energy at the ground is 490 J.

Hence, The potential energy at 20 m is 1960 J,

The kinetic energy at the ground is 1960 J.

The potential energy at 15 m is 1470 J,

The kinetic energy at the ground is 1470 J.

The potential energy at 10 m is 980 J,

The kinetic energy at the ground is 980 J.

The potential energy at 5 m is 490 J,

The kinetic energy at the ground is 490 J.

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Topic : potential energy

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