A car travel in a stright line at 40 km/h for 1 hour and at 60 km/h for 2 hours ?
A- How far does it travel?
It travels for 160 km.
B-Find the avergae velocity?
v= 160-0\2-0= 80km/h.
Are my answers correct?
2007-02-24 00:31:46 · 4 answers · asked by Grace 2 in Science & Mathematics ➔ Physics
First one is, the second isn't.
v= 160/3 hrs=53.33 km/hr
2007-02-24 00:37:16 · answer #1 · answered by Anonymous · 0⤊ 0⤋
I congratulate you. Im sick of reading question where the answer doenst make any kind of effort. You tried, even if you didnt get all right. As other people already told you, the second one is wrong. The car travelled for 3 ours, but the method is the right one.
Just think about this: if the first number is 40, and the second is 60, the average must be in the middle, it cant be 80...
Take care and go on working, this is the way how you will get to learn some Physics.
Ana
2007-02-24 03:01:32 · answer #2 · answered by MathTutor 6 · 0⤊ 0⤋
Your 1'st answer is correct. But in your 2'nd answer, the car travels 160 km in 3 hours so its average velocity is
160/3 = 53.33 km/h.
HTH âº
Doug
2007-02-24 00:39:59 · answer #3 · answered by doug_donaghue 7 · 0⤊ 0⤋
a- is correct.
for b
avg. velocity=(1*40+2*60)/3
160/3=53.33m/s
2007-02-24 00:41:40 · answer #4 · answered by jonny k 3 · 0⤊ 0⤋