A particle is dropped from a height of 20m onto a fixed triangular wedge of inclination 30?. The time gap between first two successive collisions is. (assume that collision is perfectly elastic).
(a) 2sec
(b) 2?3 sec
(c) 4sec
(d) 4?3 sec

Dear Student,
                       Velocity of particle after first collision with wedge =2gh=2×10×20=20m/sand now this will be projectile with gcos(30) vertical accelartionwith projectile angle 600t=2usin(600)gcos(300)=2×20×sin(600)10×32=4s
Regards

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