# Homework Help: 1-D kinematic Problem

1. Oct 14, 2013

### Physicsnoob90

I'm confuse by what the question is asking as far as the conversion (km/hr/s). Can any please help me?

1. The problem statement, all variables and given/known data

A jumbo jet must reach a speed of 240 km/hr on the runway for takeoff. What is the minimum constant acceleration (in km/hr/s) needed for takeoff from a 1.34 km runway? (3 sig fig)

2. Relevant equations

3. The attempt at a solution

a=vf^2/2(Δx)

a=(240 km/hr)^2/2(1.34 km) = (57600 km^2/hr^2) / (2.68 km) = 21492.53731

2. Oct 15, 2013

### Physicsnoob90

Ignore this question. Finally solved it!

3. Oct 15, 2013

### NihalSh

Your answer is correct, in $km/hr^2$!!!......you want to convert units???....

$$21492.53731\frac{km}{hr^2}=21492.53731\frac{km}{hr^2}*\frac{1 hr}{60 min}*\frac{1 min}{60 sec}=??? \frac{km}{hr.sec}$$

Remember only three significant figures.

Edit : I guess you solved it!!!