1.

A body of mass 2kg falls from rest what will be its k.e. during the fall at the end 2 seconds .

Answer» G = 9.8m/s ,
m = 2 kg
t = 2 seconds
u = 0
V = ?
v = u + gt
  = 0 + 9.8 *2 = 19.6 m/s
K.E.=?
\frac{1}{2} mv^2K.E.= 
\frac{1}{2} * 2 *(19.6 )^2       = 
       = 384.16 J 




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