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2015-10-27T19:43:15+05:30

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it is given that , 
mass of the object = g

initial velocity = 5 m/s
final velocity = 0 m/s
acceleration due to gravity = -10 m/s^2 ( it is -10 m/s^2 since it is in the opposite direction to the gravity )
2as = v^2-u^2
2(-10)(s) = 0^2 - (5)^2
-20s = -25
s = -25/-20
s = 1.25 m
work done = force * displacement
work done = mass * acceleration * 1.25
work done = g * -10 * 1.25
work done = -12.5 * g
     therefore the work done by the gravity is -12.5 * g J.( work done will be 12.5 times the g means the mass but in -ve since the motion is in opposite direction to the force applied ) 
i hope that this will help u........................^_^

1 5 1
g is 9.8m/s raise to 2 no
ya but we can use 10 m/s^2 also because if we round off 9.8 we get 10 m/s^2 it is used to make calculation easier.
2015-10-27T21:24:19+05:30

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Use conservation of energy theorem. It will be easier.
PE at top point = initial KE 
⇒ PE = 1/2mv² = 1/2 × g × 5² = 12.5 g

Potential energy = -(work done by gravity) 
So work done by gravity = -12.5g
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