Ball A is launched straight upward from ground level with a speed of

PHYSICS · Subjective · AP · Physics 1: Algebra-based · Kinematics · Kinematics

Problem

20\,\text{m/s}

. Exactly

2.0\,\text{s}

later, Ball B is launched upward from the same point with speed

v_B

. The two balls pass each other at a height of

15\,\text{m}

above the launch point. Neglect air resistance and take

g = 10\,\text{m/s}^2

. Determine

v_B

. Give your answer in

\text{m/s}