Relative Motion Assignment

A boatman crosses a float after 1hr of this event boatman takes a u-turn and it again crosses the float but now the float is at 6km from its initial position of the float,find the velocity of the river.

A train is approaching a platform with a speed of 10 km/hr.when it is at a distance of 2 km from the platform breaks are applied so that a uniform retardation is produced. at the same time ,a bird sitting on the pole near the platfiorm flies with the speed of 50 km/hr towards the train  touches the front of the train and then returns to the pole.if the motion is repeated until the train comes to rast,the total distance travelled by the bird is?

Two ships A and B are 10 km apart on north south. If A ship is due north of B,A travels towards east with velocity 5km/hr. ShipB travels due north with speed 5km/hr. Find the shortest distance between them.

A man can swim directly a stream of width 100m in 4 minutes, when there in no current of water and in 5minutes when there is current of water. The velocity of the current of water in that stream is

2 objects are moving at 120m/s in opposite directions. Are their velocities the same? Give reason

If we are sitting in the train and we have a ball, the train is running, we throw the ball into the air, then will the ball come in our hands or not?

The distance between two places A and B on road is 70 kilometers. A car starts from A and the other from B. If they travel in the same direction, they will meet after 7 hours. If they travel towards each other they will meet after 1 hour, then find their speeds

Two person start travelling at the same time in opposite direction at the speed of 4m/s and 6m/s respectively.After 1 hour of travelling what will the difference of their speed?