How is the excited PS II brought back to the ground state?

An object thrown at a certain angle to the ground moves in a curved path and fails back to the ground.. The initial and the final points of the path of the object lie on the same horizontal line. What is the work done by the force of gravity on the object?

Water drops fall at regular intervals from a tap, which is 5 m above the ground. The third drop is leaving the tap at the instant the first drop touches the ground. How far above the ground is the second drop at that instant?

A body is allowed to fall from a height of 20 metres from the ground. How much time will take to reach the ground? What will be its velocity just a moment before hitting the ground?

A cricketer can throw a ball to a maximum,horizontal distance of 100 m. How much high above the ground can the cricketer throw the same ball?

40 coins are placed in a straight line on a ground.The distance between any two consecutive coins is 10m.How far must a person travel to bring them one by one to a basket placed 10m behind the first coin?