motion in a straight line
1. A Boat covers certain distance between two spots in a river taking t1 hrs going downstream and t2 hrs going upstream. What time will be taken by boat to cover same distance in still water?
2. A particle starts moving with acceleration 2 m/s2 . distance travelled by it in 5th half second is ?
3. The two ends of a train moving with constant acceleration pass a certain point with velocity u and 3u. the velocity with which the middle point of the train passes the same point is ?