Question

9. A shell is fired from a cannon with a velocity of u ms-1
at an angle with the horizontal. It explodes into two
pieces of equal masses at the highest point of its path
One of the pieces retraces its path to the cannon. The
speed (in ms) of the other piece immediately after
the explosion is :
(a) 3 v cos e (6) 2 v cos e
(c) u cos e
(d) u cos e​

Answer 1

Answer:a

Explanation:from conservation of momentum

mv=m1v1+m2v2

At highest point only horizontal component v=ucose

v1=-ucose

mucose =-mucose/2+mv2/2

v2=3ucose