You are Here: Home >< A-levels

# Physics help: boat crossing a river calculation

Announcements Posted on
TSR's new app is coming! Sign up here to try it first >> 17-10-2016
1. Any help would be appreciated. I have answers to (a) and (b), not sure about (c) but tbh not 100% on all

*PIC BELOW*
2. thanks!
Attached Images

3. a) I assume it means the resultant speed from both, as the two speeds (boat and river) are perpendicular you can use pythagoras to find the resultant of the two.
b) As the two speeds are perpendicular you only worry about the 1.5ms-1 towards the other bank, using speed = distance/time you can find the time taken.
c) Using your time for b) and a speed of 0.9, how far would it travel once it has reached the other side of the river?

## Register

Thanks for posting! You just need to create an account in order to submit the post
1. this can't be left blank
2. this can't be left blank
3. this can't be left blank

6 characters or longer with both numbers and letters is safer

4. this can't be left empty
1. Oops, you need to agree to our Ts&Cs to register

Updated: October 11, 2016
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Today on TSR

### How does exam reform affect you?

From GCSE to A level, it's all changing

Poll

## All the essentials

### Student life: what to expect

What it's really like going to uni

### Essay expert

Learn to write like a pro with our ultimate essay guide.

### Create a study plan

Get your head around what you need to do and when with the study planner tool.

### Resources by subject

Everything from mind maps to class notes.

### Study tips from A* students

Students who got top grades in their A-levels share their secrets