A projectile of mass m is fired with a speed v = 20 m/s at an angle θ = 45° from a smooth horizontal field. The coefficient of restitution of collision between the projectile and the field is e = 
. How far from the starting point, does the projectile make its third collision with the field?
Text Solution
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R 1 = V cos θ T 1
R 2 = V cos θ T 2
R 3 = V cos θ T 3
R = R 1 + R 2 + R 3 = u cos θ [T 1 +T 2 + T 3 ]
= V cos θ 
R = 
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