Answers

2015-03-20T19:26:56+05:30
KINETIC ENERGY = 1/2 mv²
4 = 1/2 × 2 × v²
4 = v²
v=2 m/s
speed of the object = 2m/s
3 4 3
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2015-03-21T16:04:32+05:30
Here,
m=2 kg
K.E.=4 J
now,
K.E.=4 
 or  =4
or 1/2*2*v^2=4
or v^2=4
or v^2=2 m/s  ans.
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