JEE Main2002PhysicsMotion in One DimensionActual
From a building two balls A and B are thrown such that A is thrown upwards A and B downwards (both vertically). If v _ A and v _ B are their respective velocities on reaching the ground, then
Options
- AV _ B > V _ A
- BV _ A = V _ B
- CV _ A > V _ B
- Dtheir velocities depend on their masses
Correct answer
B. V _ A = V _ B
Step-by-step solution
As the ball moves down from height ' h ' to ground the P.E at height ' h ' is converted to K.E. at the ground (Applying Law of conservation of Energy) Hence, 1 2 m_A v_A^2=m_A g h_A or v_A= 2 g h_A ; Similarly, v_B= 2 g h or v_A=v_B