Question

26. A body at rest breaks into two pieces of equal masses. The parts will move
A)
O
along different lines
in opposite directions with equal speeds
B) in same direction
D) in opposite directions with unequal speeds​

Answer 1

c) in opposite directions with equal speeds

Explanation:  Let the velocities of two parts be v and v' and mass of each part = m. Momentum before the break = 2m*0 = 0.  Momentum after the break =mv+mv'. Since there is no external force on the body, the linear momentum will be conserved.  →mv+mv' = 0  →v = -v' So the parts will move in opposite directions with equal speeds.