Explanation:
K.E. of marble 1 = (1/2) × 0.2 × (22/0.8) ^2
= 0.1 × 756.25
= 75.625
K.E. of marble 2 = (1/2) × 1.2 × (26/0.8)^2
= 0.6 × 1056.25
= 633.75
The thing should be at a space less than the focal length
from the convex or also known as converging lens in a way to develop a virtual
image. The image made would be standing, virtual and enlarged, just like how a
magnifying glass does. The virtual image is shaped on the same side of the lens
as the object.
Then, it's speed must be increased by 4 times.
As we know, K.E. α v²
<span>I think the average velocity b/w t =a and t= b would be
Avg vel. = change in vel./ change in time</span>