Two spherical balls lie on the ground touching, if one ball has a radius 8 units and the point of contact is 10 units above the ground what is the radius of the other ball

Two balls are dropped to the ground from different heights. One ball is dropped 2 s after the other but they both strike the ground at the same time. If the first ball takes 5 s to reach the ground, then the difference in initial heights is (Take "g = 10 m s"^(-2) )

An iron spherical ball has been melted and recast into smaller balls of equal size. If the radius of each of the smaller balls is 1//4 of the radius of the original ball, how many such balls are made? Compare the surface area, of all the smaller balls combined together with that of the original ball.

An iron spherical ball has been melted and recast into smaller balls of equal size. If the radius of each of the smaller balls is 1//4 of the radius of the original ball, how many such balls are made? Compare the surface area, of all the smaller balls combined together with that of the original ball.

N solid metalic spherical balls are melted and reast into a cylindrical rod whose radius is 3 times that of a spherical ball and height is 4 times the radius of a spherical ball. The value of N is

Two elastic balls of masses M and m (M gt gt m) are placed on top of each other with a small gap between them. The balls are dropped on to the ground with the bottom of the lower ball at height h above the ground. The lower ball has a radius R and the upper ball has negligible dimension. (a) Up to what height the ball of mass m will bounce above the ground ? (b) Does the result obtained above violates the low of conservation of mechanical energy?

A spherical ball of radius 3 cm is melted and recast into the spherical balls. The radii of two of these balls are 1.5 cm and 2 cm. Find the radius of the third balls.

A spherical ball of lead 6 cm in radius is melted and recast into three spherical balls. The radii of two of these balls are 3cm and 4 cm. What is the radius of the third sphere ?