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20. A particle moves along X-axis in such a way that its coordinate X varies with time t according to theequation x (2-5t +6t2mTe iil velocity of the particle istA)-5 m/s (B) 6 m/s(c)-3 m/s(D) 3 m/s

Answer»

Particle is moving along x-axis so displacement is also along x-axis

Now , ⇒ x = 6t²-5t+2

since , V = dx/dt

Differentiating w.r.t. 't'

⇒ v = 6 × 2t - 5

⇒ v = 12t - 5

Hence initial velocity

v = 0-5 = -5 m/sec



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