1.

2mgA body moves along a straight line and the variation of its kinetic energy withtime is linear as depicted in the figure belowThen force acting on the body is(A) directly proportional to velocity(B) inversely proportional to velocity(C) zero(D) constant11sKEtimeRag Office: GG Tower, A-46 & 52, IPIA, Near City Mall, Jhalawar Road, Kota (Raj.)- 324005

Answer»

Since kinetic energy is increasing , ans K.E = 1/2*(M)V² SO , velocity will also be increasing.. it meas the the body is accelerating

from graph K.E ∞ t => V² ∞ t or v² = k.t or v = √(kt)so differentiating it for acceleration dv/dt = a = (1/2)√k.(1/√t)

a ∞ 1/√t so acceleration will be decreasing with time.. and hence force will also decrease.

so force will be inversly proportions to velocity.

option B.



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