Kinematics Question 329
A boat takes two hours to travel 8 km and back in still water. If the velocity of water is 4 km/h, the time taken for going upstream 8 km and coming back is [EAMCET 1990]
Options:
A) To fall vertically down
B) To fall at an angle going from west to east
C) To fall at an angle going from east to west
The information given is insufficient to decide the direction of rain.
Show Answer
Answer:
Correct Answer: B
Solution:
A man it’s sitting in a bus and travelling from west to east, and the rain drops are appears falling vertically down.
$ v _{m}= $ velocity of man
$ v _{r}= $ Actual velocity of rain, which is falling at an angle
$ \theta$ with vertical
$ v _{rm}= $ velocity of rain w.r.t. to moving man
If another man observes the rain, then he will find that actually rain is falling with velocity
$ v _{r} $ at an angle going from west to east.
BETA
