A toy plane P starts flying from point A along a straight horizontal line 20 m above ground level, starting with zero initial velocity and acceleration 2 m/s². At the same instant, a man P throws a ball vertically upwards with initial velocity u. The ball touches (coming to rest) the base of the plane at point B vertically above the man. Let s be the distance of B from A. Just after the contact of ball with the plane, the acceleration of the plane increases to 4 m/s². Take g = 10 m/s². Find the initial velocity u of the ball (m/s).
Physics · Kinematics part-2 Projectile Motion · Projectile from height
A toy plane P starts flying from point A along a straight horizontal line 20 m above ground level, starting with zero initial velocity and acceleration 2 m/s². At the same instant, a man P throws a ball vertically upwards with initial velocity u. The ball touches (coming to rest) the base of the plane at point B vertically above the man. Let s be the distance of B from A. Just after the contact of ball with the plane, the acceleration of the plane increases to 4 m/s². Take g = 10 m/s². Find the initial velocity u of the ball (m/s).
