A particle is moving with speed v = b x along positive x - axis. Calculate the speed of the particle at time…

A particle is moving with speed v=bx along positive x- axis. Calculate the speed of the particle at time t=τ (assume that the particle is at origin at t=0 )
  1. b2τ
  2. b2τ2
  3. b2τ2
  4. b2τ4

Solution

v=bx … (1)
dxdt=bx
dxx=bdt
0xdxx=0tbdt
2x=bt … (2)
From equation (1) and (2)
v=bbt2
at t=τ 
v=b2τ2

Asked in: JEE Main 2019 (12 Apr Shift 2)

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