a body of mass 5 kg initially at rest is subjected to force of 20 Newton what is the kinetic energy acquired by the body at the end of 10th
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Force = mass × acceleration
A= F/m
a= 4 m/s ².
We know that,
K.e = 1/2 mv²
To find v:-
V= u+at
V= 0+40
V= 40 m/s.
K.E = 1/2 ×5×40×40
K.E =4000 J
1/2mv^2
mass given
we need to find velocity of body
according to question initial velocity is zero
we know force= m.a.
20=5×v-u/t
here time is 10 sec. so
20=5×v-0/10
4=v/10
v=40m/sec
now
k.e.=1/2×5×40×40
1/2×8000
k.e.=4000J
thats your answer