Figure shows velocity and acceleration of a point like body at initial moment of its motion. directi

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3-2.Motion in Plane

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The figure shows the velocity and the acceleration of a point like body at the initial moment of its motion. The direction and the absolute value of the acceleration remain constant. Find the time when the speed becomes minimum.........$s$ (Given : $a = 4\, m/s^2, v_0 = 40\, m/s, \phi =143^o$)

A

$8$

B

$6$

C

$10$

D

$16$

Solution

$40 cos37=32 m/s$

$t=\frac{32}{4}=8 \mathrm{sec}$

Standard 11

Physics

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