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A particle moves according to the law x = at, y = at (1 - at) where a and α are positive constants

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A particle moves according to the law x = at, y = at (1 - at) where a and α are positive constants and t is time. The time instant at which velocity makes an angle π/4 with acceleration is 

(a) 4/α

(b) 3/α

(c) 2/α

(d) 1/α 

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Correct option (d)1/α 

Explanation:

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