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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 |
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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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