A block of mass `4 kg` is initially at rest on a horizontal frictionless surface. A force `vec(F) = (2x+3x^(2))hat(i) N` acts ho

A block of mass `4 kg` is initially at rest on a horizontal frictionless surface. A force `vec(F) = (2x+3x^(2))hat(i) N` acts horizontally on it. The maximum kinetic energy of the block between `x = 2m` and `x=4m` in joules is
A. `40`
B. `36`
C. `68`
D. `52`

A block of mass `4 kg` is initially at rest on a horizontal frictionless surface. A force `vec(F) = (2x+3x^(2))hat(i) N` acts horizontally on it. The

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