Physics
A boy sitting in an open car moving with the constant speed throws a ball straight up into the air. The ball falls

Into his hand
In front of him
Behind him
By his side

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Physics
Stationary wave is formed by

Two waves of the same speed superposing
A transverse wave superposing a longitudinal wave
Two waves of same frequency travelling in the same direction
Two waves of same frequency travelling in the opposite direction

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