15.b please solve.....
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V = u+at
V1 = s×t =20×1=20ms
V2 = s×t = 2×40=80ms
U = 0
Substituting
V1= 0+a(1)
a=20m/s
V2 = 80ms
80=0+a(2)
a=40ms
Acceleration=40+20
=60ms
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