Question

Working7A stone of mass 10 g is thrown vertically upwards. Its minimum and maximumdistance from a fixed point A is 6 m and 65 m, respectively. When the stone is atthe maximum height, it is at a distance 10 m from point A. Find initial kineticenergy of the ball.a. 1 Jb. 2 JC. 3 Jd. 4 J​

Answer 1

Answer:

Let u be the initial velocity and h be the maximum height attained by the stone.

v

1

2

=u

2

−2gh,

(10)

2

=u

2

−2×10×

2

h

100=u

2

−10h ....(i)

Again at height h,

v

2

2

=u

2

−2gh

(0)

2

=u

2

−2×10×h

u

2

=20h ... (ii)

So, from Eqs. (i) and (ii) we have

100=10h

h=10m