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1-D kinematic Problem

  • #1
I'm confuse by what the question is asking as far as the conversion (km/hr/s). Can any please help me?

Homework Statement



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)

Homework Equations





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
 

Answers and Replies

  • #2
Ignore this question. Finally solved it!
 
  • #3
199
15
I'm confuse by what the question is asking as far as the conversion (km/hr/s). Can any please help me?

Homework Statement



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)

Homework Equations





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
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!!!
 

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