Question

The position of a particle moving along x-axis is related to time 't' as follows x = 1 - 3t (x is in metre
and t in seconds). Particle's average speed in first 3 seconds is
(a) 3/2 m/s
(b) 3 m/s
(c) 2 m/s
(d) 0

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Answer 1

Answer:

(b)3m/s

Differentiating x

dx/dt=1-3t

=0-3

=3

bcz speed is never negative