Question

A river current has a velocity of 5 km/h relative to the shore, and a boat moves in the same direction as the current at 5km/h relative to the river. How can the velocity of the boat relative to the shore be calculated?

Answer 1

A.) by subtracting the river current vector from the boat's velocity vector
B.) by dividing the river current by the boat's velocity vector
C.) by multiplying the vectors
D.) by adding the vectors

Answer 2

@Compassionate

Answer 3

@linda3

Answer 4

I'm sorry but I'm not great at Physics, but if you need help in History or writing just tag me :)

Answer 5

mk

Answer 6

two questions:
1) Have you studied vectors.
2) Have you studied inertial frames and different frames of reference?

Answer 7

just started today and no

Answer 8

my mom thinks its D

Answer 9

@blitzkrieg100

Answer 10

And your mom would be right. Too bad I can't give her a medal. :)
Now do either of you know WHY it's D?

Answer 11

not really

Answer 12

Ok, the thing with this question is that it has to do with relative motion which you said you haven't started yet. However relative motion tends to be in the (maybe) first few chapters of mechanics.

So let me break this problem down into two parts.
First is the the river relative to the shore.
Now, an object relative to itself is NEVER moving. You could be moving at 50 mph north, but relative to yourself you wouldn't be moving, the surrounding area would be moving -50 mph north or 50 mph south. Does that make sense?