# Locomotive speed homework

#### ferishta

1. A locomotive is accelerating at 1.6 m/sec2. It passes through a 20.0-m-wide crossing in a time of 2.4 s. after the locomotive leaves the corssing, how much time is required until its speed reaches 32 m/s?

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#### hage567

Homework Helper
Hi ferishta,

You need to show some work in order to get help. What have you tried so far? What equations do you know that might be useful? No one is going to do your homework for you.

#### Quang

the initial velocity of the locomotive:
Vot + 1/2at^2 = s
=> Vo=6.41
the velocity of the locomotive when it just leaves the crossing:
V^2 - Vo^2 = 2as
=> V=10.25

32 - 10.25 = 1.6 x t
=> t = 13.6s

#### ferishta

Hey Quang,
Thanks for the help...I was really having a tough time becuase... I was not able to find the proper formulas to find, my physics professor expects us to know everything when it is an introductory course.
Thanks again,
Ferishta

#### hage567

Homework Helper
Quang,

Please note that providing solutions to homework problems is against forum rules (the ones you agreed to when you registered here, by the way).

#### ZapperZ

Staff Emeritus
2018 Award
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#### Quang

i'm sorry... i didnt pay attention

"Locomotive speed homework"

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