Question

The position of the particle is given by x=t+cost then the time when it's velocity becomes 0 is
A. 0.3s
B. 1s
C. 0.2s
D. 1.57s

Answer 1

Answer:

$\frac{dx}{dt} = v = 1 - sin(t) = 0 \\ \\ \sin(t) = 1 \\ \\ t = \frac{\pi}{2} \\ \\ = > t = \frac{\pi}{2} + \cos( \frac{\pi}{2} ) = \frac{\pi}{2} = 1.57$

Answer 2

Answer:

answer is option D 1.57s

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