A point moves along a circle or radius 20 cm with a constant tangential acceleration 5 cm s2. How much time is required after motion begins for normal acceleration to become equal to tangential acceleration?
A
2.5 s
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B
0.025 s
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C
2 s
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D
0.5 s
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Solution
The correct option is C2 s
dvdt=5
using CGS through out
v=5t
v2r=525t220=5
(acceleration = triangle acceleration aul to velocity) t=2sec