Question

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Answer 1

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⏩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

Answer 2

hola mate..!!

Answer:-

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..!!