A massive vertical wall is approaching a man at a speed u. When it is at a distance of 10 m, the man throws a ball with speed 10 m/s at an angle of 37°, which after having a completely elastic collision with the wall, reaches back directly into the hands of the man. The velocity of the wall is
m/s
m/s
m/s
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Text Solution
Verified by ExpertsA
m/s
As the vertical motion remains unaffected
...(1)
from coefficient of restitution along the line of collision
v-2u=8 ...(2)
by the time (ti) ball collide with wall, distance travelled by man = 10 – ut 1
…(3)
by the time (t 2 ) ball reach the hand of man 
...(4)
Since T = t 1 + t 2 ...(5)
from equation (2), (3), (4), (5)
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