Physics, asked by tarunmathur192, 1 year ago

a body of mass 2kg is lifted up to a height of 10m & than allowed to fall freely . find the potential & kinetic energy that it has just before touching the ground.


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Answers

Answered by nope
1
just before reaching the ground 
h=0 m 
so potential energy = 0
and initial velocity = 0 so 
2gh=v^2
2*10*10=v^2
200=v^2
v=√200m/s
now k.e = 1/2*2*√200*√200
           =200 J

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Answered by TPS
1
mass of body, m = 2kg

it is lifted to height = 10m
initial KE = 0
initial PE = mgh = 2×10×10 = 200J

when it is dropped, just before touching ground,
height = 0
final PE = mgh = 2×10×0 = 0J

According to conservation of energy,
Total initial energy = Total final energy
⇒ 0 + 200 = 0 + final KE
⇒ final KE = 200J

So, just before touching ground, KE is 200J and PE is 0J.
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