A ball of mass is projected vertically upward from the ground with a speed of
PHYSICS · Subjective · CBSE · Physics · Work and Energy · Work and Energy
Problem
A ball of mass 200g is projected vertically upward from the ground with a speed of 20m/s. Ignore air resistance and take g=9.8m/s2.
(i) Calculate the initial kinetic energy of the ball.
(ii) Determine the maximum height reached by the ball above the ground.
(iii) While the ball is moving upward, find its speed when it is 10m above the ground.
(iv) Compute the total mechanical energy of the ball at (a) the point of projection, (b) the height of 10m, and (c) the highest point. Show that the mechanical energy remains constant during the motion.