An object is projected from ground with speed 20 ,m / s at angle 30^{circ} with horizontal. Its cent

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3-2.Motion in Plane

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An object is projected from ground with speed $20 \,m / s$ at angle $30^{\circ}$ with horizontal. Its centripetal acceleration one second after the projection is .......... $m / s ^2$ [Take $g=10 \,m / s ^2$ ]

A

$10$

B

$0$

C

$5$

D

$12$

Solution

(a)

$T =\frac{2u \sin \theta}{g}$

$=\frac{2 \times 20 \times 1 / 2}{10}=2 \sec$

$t=1$ partical at highest point

$a_c=g=10 m / s ^2$

Standard 11

Physics

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