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Question

Horizontal square shaped platform of side $$10$$ m on the ground has initially sides coinciding with x-axis and y-axis as shown. A platform starts moving along x-axis with a velocity $$10$$ m/s. A person standing on the platform starts moving on platform towards diagonally opposite corner as shown, with a velocity $$5\sqrt 2 $$ m/s. A stationary person standing at origin (Not on the platform) throws a ball in air so that the ball hits the person on platform when it is exactly at corner of the platform. Find the velocity of the ball

A
$$5\sqrt 11 $$ m/s
B
$$5\sqrt 5 $$ m/s
C
$$5$$ m/s
D
$$5\sqrt 10 $$ m/s
Solution
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Correct option is C. $$5$$ m/s

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