Answer:
Correct option is (b)
Explanation:
Given a ball at rest falls from platform so initial velocity of the ball,
u =0
The ball hits the ground at time t = 1.1 s.
To calculate the height of the platform use equation of motion,
[tex]h=ut+\frac{1}{2} at^{2}[/tex]
Here h is the height u is initial velocity of the ball t is time taken to hits the ground by ball and a is acceleration due to gravity and its .
Substitute the given values in above formula, we get
[tex]h=0+\frac{1}{2} (9.8 m/s^{2})(1.1s)^{2}[/tex]
[tex]h=5.9 m[/tex]
Thus, the height of platform is 5.9 m.
