A ball is moving with speed of 6 m/s on horizontal surface falls in a vertical trench 4 m wide and 20 m deep. All collisions are elastic then $[g=10m/s^2]$

Q. A ball is projected horizontally from top of a 80 m deep well with velocity $10m/s.$ Then particle will fall on the bottom at a distance of (all the collisions with the wall are elastic and wall is smooth)
(Take $g=10m/s^2$)

Q. A tennis ball is hit with a vertical speed of $10m/s$ upwards and a horizontal speed of $30m/s$. How far will the ball travel horizontally before landing?

Q. A ball projected from the ground hits a wall at 480 m. If collision of ball with wall is elastic, then after what time will the ball land on the ground ?

Q. A ball of mass $10\text{kg}$ initially at rest starts moving under the influence of a constant force $50\text{N}$. Ball covers $10\text{m}$ before colliding a heavy wall which is moving towards the ball with speed $10\text{m/s}$ as shown in figure. If force stops acting on ball just before collision and collision is perfectly elastic, find the velocity of ball after collision.

Q. In a figure shown, the two identical balls of mass M and radius R each, are placed in contact with each other on the frictionless horizontal surface. The third ball of mass M and radius R/2, is coming down vertically and has a velocity= $v_0$ when it simultaneously hits the two balls and itself comes to rest. Then, each of the two bigger balls will move after collision with a speed equal to