Question

11.) A small ball is dropped from a balloon moving
vertically up at a speed 10 m/s when the balloon
is at a height 15 m from the ground. Neglect air
friction and take g = 10m/s? Which of the
following is not suitable to the present situation?
(1) The ball reaches the ground in 3 s
(2) The ball covers a distance of 25 m
(3) The magnitude of average velocity of the ball is
8.33 m/s
(4) The ball moves up at a speed 10 m/s at an
instant when it is dropped from the balloon​

Answer 1

Answer:

OPTION (C) IS THE CORRECT ANSWER

Explanation:

TOTAL DISPLACEMENT OF THE BALL=15m

FROM THE FIRST EQUATION IF MOTION :v=u-gtO

=10-10 tt = 1 snow,h'= ut- 12gt2h'=10×1-12×10×12h'=5mnow,Let time taken to the fall h'+15 metresit t' then,h'+15=ut'+2gt'220=0×t'+12×10×t'2t'2=4t'=2snow total time to faLL on the ground=3stotal distance covered=h'+h'+15=25 m average velocity=total displacement total time=153=5m/s

Thus magnitude of the average velocity can be 8.33 m/s.