Remove all balls from this puzzle #shorts

A ball of mass 5 kg hanging from a spring oscillates with a time period of 2 pi s . At any instant the ball is at equilibrium position, now the ball is removed, then spring shortens by

A bag contains a red ball, a blue ball and a yellow ball, all the balls being of the same size. Nayan takes out a ball from the bag. What is the probability that he takes out : (i) yellow ball (ii) red ball (iii) blue ball?

A bag contains a red ball,a blue ball and a yellow ball,all the balls being of the same size. Kritika takes out a ball from the bag without looking into it.What is the probability that she takes out the (i) yellow ball? (ii) red ball? (iii) blue ball?

A small ball of mass m is released from rest from the position shown . All contact surface are smooth . The speed of the ball when it reaches its lowest position is

A ball of mass m kg hangs from a spring of spring constant k . The ball oscillates with a period of T seconds if the ball is removed, the spring is shortened( w.r.t. length in mean position) by

If one wished to remove substantially all of all chloride ions from an aqueous solution, this could be done by the addition of an aqueous solution of