# Determine speed of man and acceleration of bus

Watch
Thread starter 1 year ago
#1
Question: https://prnt.sc/qn9s1e

The time a faster object overtakes a slower one is at the point where the distance travelled & time taken to travel that distance is the same for both objects. So I tried to make the 2 displacements where t = 30 equal to each other, but I can't exactly 'solve' the equation as I have 2 unknowns: 50 + 450a = 30u
0
reply
1 year ago
#2
There is a second equation
Just catches bus implies their speeds are equal when he gets to the bus
See photo
0
reply
1 year ago
#3
0
reply
Thread starter 1 year ago
#4
(Original post by swinroy)
There is a second equation
Just catches bus implies their speeds are equal when he gets to the bus
See photo
Are the speeds always equal at the time a faster object overtakes a slower one, or is this the only exception?
0
reply
1 year ago
#5
(Original post by TSR360)
Are the speeds always equal at the time a faster object overtakes a slower one, or is this the only exception?
No, they're not always equal. The operative word here is "JUST", as in he "just catches the bus". If he'd been going any slower he wouldn't have caught it. If faster, he'd have overtaken it. Just catches it implies at the time of meeting they were going at the same speed.
0
reply
1 year ago
#6
See this thread: https://www.thestudentroom.co.uk/sho...68&postcount=3
Last edited by RDKGames; 1 year ago
0
reply
1 year ago
#7
(Original post by TSR360)
Are the speeds always equal at the time a faster object overtakes a slower one, or is this the only exception?
This is a special case or as you say an exception because:
If you only just catch the bus, you must be travelling at the same speed or you will hurt yourself when you hit the road by just missing it.
ONLY JUST is the key in this problem
0
reply
X

Write a reply...
Reply
new posts
Back
to top
Latest
My Feed

### Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

see more

### See more of what you like onThe Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

### Poll

Join the discussion

#### What would make a great online university open day?

Virtual campus tour (55)
19.57%
Virtual accommodation tour (38)
13.52%
Find out about sports clubs, societies and facilities (14)
4.98%
Video content about the local area (2)
0.71%
Webinars with lecturers (10)
3.56%
Taster lectures or seminars (66)
23.49%
Speak to current students studying my course (59)
21%
Speak to current students about the uni in general (11)
3.91%
Fun online activities or experiences (10)
3.56%
Connecting with careers services or employers (7)
2.49%
Info about student wellbeing and support services (4)
1.42%
Something else (let us know in the thread!) (5)
1.78%

View All
Latest
My Feed

### Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

### See more of what you like onThe Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.