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A box of mass `m=2 kg` resting on a frictionless horizontal ground is acted upon by a horizontal force F, which varies as shown. Find speed of the par

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A box of mass `m=2 kg` resting on a frictionless horizontal ground is acted upon by a horizontal force F, which varies as shown. Find speed of the particle when force ceases to act.
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`vec(p)_(f)= vec(p)_(i) + vec(I)_(m)p rarr m vec(v)_(f) = m vec(v)_(i) + int_(t)^(f) vec(F)dt`
`2v=2 xx 0 + 1/2 xx 20 xx 4`
`v=20 m//s`
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