Q9 JEE Advanced 2019 Paper 2 Physics | Malayalam Solution | Motion in a plane 

JEE Advanced 2019 Physics Malayalam Solutions
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A ball is thrown from ground at an angle  with horizontal and with an initial speed u0. For the resulting projectile motion, the magnitude of average velocity of the ball up to the point when it hits the ground for the first time is V1. After hitting the ground, the ball rebounds at the same angle θ but with a reduced speed of u0/α. Its motion continues for a long time as shown in figure. If the magnitude of average velocity of the ball for entire duration of motion is 0.8 V1, the value of α is __________
Educator: Muhammed Ziyan, an undergraduate in Engineering Physics at IIT Delhi.