AS M1 Maths SUVAT Equations help

I'm stuck on this question about SUVAT equations, but I don't know how to answer it because I feel like there isn't enough information, Could someone help me answer it?

The question is:

A bus is approaching a tunnel. The driver slows down steadily from a speed of U ms-1 to 20 ms-1 in 15 seconds. The driver maintains this speed for the 25 seconds it takes to drive through the tunnel. After emerging from the tunnel, he accelerates steadily, reaching a speed of U ms-1 in 30 seconds.

Calculate the length of the tunnel.

Reply 1

ghostwalker

17

Original post by loginrunner

I'm stuck on this question about SUVAT equations, but I don't know how to answer it because I feel like there isn't enough information, Could someone help me answer it?

The question is:

A bus is approaching a tunnel. The driver slows down steadily from a speed of U ms-1 to 20 ms-1 in 15 seconds. The driver maintains this speed for the 25 seconds it takes to drive through the tunnel. After emerging from the tunnel, he accelerates steadily, reaching a speed of U ms-1 in 30 seconds.

Calculate the length of the tunnel.

If anything, there's too much information.

The driver maintains a speed of 20ms-1 for the 15 seconds she's in the tunnel.

The remaining information isn't pertinent.

Reply 2

AdeptDz

21

[deleted]

(edited 7 years ago)

Reply 3

loginrunner

OP

19

Original post by ghostwalker

If anything, there's too much information.

The driver maintains a speed of 20ms-1 for the 15 seconds she's in the tunnel.

The remaining information isn't pertinent.

Thank you so much I overcomplicated this way too much.

Reply 4

Glib

13

Original post by ghostwalker

If anything, there's too much information.

The driver maintains a speed of 20ms-1 for the 15 seconds she's in the tunnel.

The remaining information isn't pertinent.

Man, you always seem to be on maths threads and give really helpful advice too!