Physics, asked by RajputAdarshsingh, 10 months ago

solve this activity with explanation for brainlist​

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Answered by RonakMangal
1

Answer:

please who see this said thanks

Lets call height at 4m=A

3m=B

2m=C

1m=D

Potenial energy a A = mgh=(20 x 10 x 4 )J=800 J

Kinetic energy at A =(1/2)mv2

as we know body is stationary at A so v=0 so K.E.=0

Potential energy at B =mgh=(20 x 10 x 3)J =600J

For Kinetic energy at B

By equation off motion- v2- u2=2as

=>v2-0=2(10)(1)

=>v2=20

Kinetic energy at B=(1/2)mv2

=(1/2)(20)(20) J .......[v2=20 as proven above]

=200J

Potential energy at C =mgh=(20 x 10 x 2)J

=400J

For Kinetic energy at C

by using equation of motion-v2-u2=2as

=>v2-0=2 x 10 x 2

=>v2=40

Kinetic energy at C =(1/2)mv2

=(1/2)(20)(40) J .....[v2 = 40 as proven above]

=400J

Potential energy at D =mgh=(20 x 10 x 1)J

=200J

For Kinetic energy at D

By using equation of motion- v2 - u2=2as

=>v2 - 0=2 x 10 x 3

=>v2=60

Kinetic energy at D =(1/2)mv2

=(1/2)(20)(60) J

=600 J

hope it helps ......:)

Answered by deepsen640
1

Explanation:

Given that,

the mass of body = 20 kg

It is dropped from 4 m

when the height is 4 m from ground

portential energy = mgh

= 20 × 10 × 4

= 800 J

it velocity will zero

so,

Kinetic energy = 0

Now,

when the height = 3 m

so,

pottential energy = 20 × 10 × 3

= 600 J

it has travelled 1 m

so,

V = √2gh

= √2 × 10 × 1

= 2√5

Velocity = 2√5 m/s

so,

kinetic energy = ½ × 20 × 2√5²

= 200 j

Now,

Height = 2 m

so,

Pottential energy = 20 × 10 × 2

= 400 j

Now,

velocity = √2 × 10 × 2

= 2√10 m/s

so,

Kinetic energy = ½ × 20 × 2√10²

= 400 j

Now,

Height = 1 m

so,

Pottential energy = 20 × 10 × 1

= 200 j

distance travelled by it = 3m

Now,

velocity = √2 × 10 × 3

= 2√15

so,

Kinetic energy = ½ × 20 × 2√15²

= 600 J

________________

Height = 4 m

Kinetic energy = 0 J

Pottential energy = 800 J

_____________________

Height = 3 m

kinetic energy = 200 J

Pottential energy = 600 J

_____________________

Height = 2 m

kinetic energy = 400 J

Potential energy = 400 J

_____________________

Height = 1 m

kinetic energy = 600 J

Pottential energy = 200 J

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