When a ball thrown upwards reaches its highest point, tick the correct statement. Class 9
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When a ball thrown upwards reaches its highest point, tick the correct statement. Class 9
Question 1.
When a ball thrown upwards reaches its highest point, tick which of the following statement(s) are correct? Class 9
(i) The force acting on the ball is zero.
(ii) The acceleration of the ball is zero.
(iii) Its kinetic energy is zero.
(iv) Its potential energy is maximum.
Answer:
The correct statements are (iii) and (iv).
(i) False - Gravity (mg) always acts on the ball.
(ii) False - Acceleration = g = 10 m s-2 downward, not zero.
(iii) True - At the highest point, velocity = 0, so K = 1/2 mv² = 0.
(iv) True - Height is maximum at this point, so U = mgh is maximum. Since total ME is conserved and KE = 0, all energy is potential.