# Homework Help: Hw Help

1. Sep 24, 2003

### cowgiljl

Hw Help
I AM HAVING 3 PROBLEMS:
1) A CAR AND A MOTOR CYL. START FROM REST ON A STRAIGHT TRACK. tHE CYC. IS 25 METERS BEHIND THE CAR. CAR ACCEL IS A UNIFORM RATE 3.70 METERS/SEC.2. THE CYLS RATE IS 4.40 METRES/SEC.2
A) TIME BEFORE CYL. OVERTAKES THE CAR?
B) HOW FAR EACH WILL HAVE TRAVELED DURNING THAT TIME?
C) HOW FAR AHEAD WILL THE CYL. BE AHEAD 2 SEC. LATER ASSUNE THE BOTH CONTINUE AT THE SAME RATE.

2) a CAR IS GOING 56 MI/HR SUDDENLY SEES THE LIGHTS OF A BARRIER 130 FEET AWAY. IT TAKE THE DRIVER .750 SEC TO APPLY THE BRAKES (REACTION TIME). WHEN THE BRAKES ARE APPLIED THE MAXIMUM DECEL. IS 30.0 FT/SEC 2? DETERMIN IF THE CAR WILL HIT THE BARRIER OR STOP BEFORE HITTING THE BARRIER

3) a ROCK IS THROWN VERTICALLY UPWARD FROM THE EDGE OF A BUILDING 19.6 METERS HIGH WITH AN INTIAL VELOCITY OF 14.7 METERS/SEC. THE STONE JUST MISSES THE BUILDING ON THE WAY DOWN AND HITS THE STREET BELOW
A) TIME TO REACH THE MAX HEIGHT?
B)TOTAL TIME OF FLIGHT?
C) HEIGHT ABOVE THE BUILDING
D) HEIGHT ABOVE THE GROUND
E) THE VELOCITY OF THE STONE JUST BEFORE IT STRIKES THE GROUND

2. Sep 24, 2003

### HallsofIvy

First, take of the all CAPITALS key. It makes it look like you are shouting and that is very annoying.

Second, read the post at the top that is titled "Read This Before Posting". We are not going to do your homework for you. Show us what you have tried and where you run into trouble. That way we will know what hints will help you find the solution for yourself.