Kinematics

JEE Main level, single correct, medium

32 of 308

Question 32 of 308

The velocity of a particle is v=(v0+gt+Ft2)ms−1v=\left({v}_{0}+gt+F{t}^{2}\right)m{s}^{-1}. Its position is x=0x=0 at t=0;t=0; then its displacement after time (t=1s)(t=1s) is :

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Answer: (B) v0+g2+F3{v}_{0}+\dfrac{g}{2}+\dfrac{F}{3}

v=v0+gt+Ft2v={v}_{0}+gt+F{t}^{2}
dsdt=v0+gt+Ft2\dfrac{ds}{dt}={v}_{0}+gt+F{t}^{2}
∫ds=∫01(v0+gt+Ft2)dt\int ds={\int }_{0}^{1}\left({v}_{0}+gt+F{t}^{2}\right)dt
s=[v0t+gt22+Ft33]01s={\left[{v}_{0}t+\dfrac{g{t}^{2}}{2}+\dfrac{F{t}^{3}}{3}\right]}_{0}^{1}
s=v0+g2+F3s={v}_{0}+\dfrac{g}{2}+\dfrac{F}{3}

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