A ship sailing in river Jhelam moves towards east. If it changes to north, through what angle does it turn?

As observed from the top of a light house,100m above sea level,the angle of depression of a ship,sailing directly towards it,changes from 30 o to 450. Determine the distance travelled by the ship during the period of observation.

A partical moves 5M towards east and then 12m towards north. Find the displacement and distance covered.

A ship sails due east according to compass. If declination at that place is 19^@ east of north. What is the true direction of ship?

A particle of mass m having velocity v moving towards north collides with similar particle moving with same velocity towards east. The two particlesstick together and move towards north east with a velocity

A ship after sailing 12 km towards south from a particular place covered 5 km more towards east. Then the straightway distance of the ship from that place is

A student moves sqrt2 x km east from his residence and then moves xkm north. He then goes xkm north east and finally he takes a turn of 90^@ towards right and moves a distance x km and reaches his school. What is the shortest distance of the school from his residence?