Questions
Two identical balls B and C, in contact with each other and at rest on a horizontal friction less table, are hit head-on by another identical ball A moving initially with a speed v as shown in fig. (3). What is observed, if
the collision is elastic ?
detailed solution
Correct option is B
Here we apply the law of conservation of energy. If m be the mass of each ball, then K.E. before collision =12mv2 case (a). After collision, kinetic energy of the system =0+12mv22+12mv22=14mv2 case (b). =0+0+12mv2=12mv2 case (c). =12mv32+12mv32+12mv32 =16mv2 case (d). =0+0+0=0 Hence case (b) is the only possible result.Similar Questions
Two balls A and B of same mass and a third ball of mass M are arranged over a smooth horizontal surface as shown in fig.(1) Ball A moves with a velocity v1
towards ball B and C. All collisions are assumed to be elastic. lf. m>M , the number of collisions between B and C
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