Initial Acceleration Homework: Find V0, a, and x0

[Heat]

here comes another one, I believe I know the answer just making sure, as if I get this wrong it is automatically marked as wrong.

Prior to this question, I was asked what was the velocity (magnitude) of the truck at t = 6.20s,

I used:

Velocity = Initial Velocity + Acceleration (Time)
I managed to get that right

Now I need to know the velocity (direction) of the truck at t = 6.20s.

The two options I got is +x axis and -x axis.

The first thing that comes to my mind is that it is the +x axis, as time is increasing, hence +x axis.

Let me know if this is the correct logic to see this statement, or if I am wrong.

Please and thank you.

 

[learningphysics]

You're correct with your answer (+x axis), but I'm not sure about the logic...

You calculated v = v0 + at. If this number came out positive, then the direction is along the +x axis. If it came out negative then the direction is along the -x axis.

 

[Heat]

You're correct with your answer (+x axis), but I'm not sure about the logic...

You calculated v = v0 + at. If this number came out positive, then the direction is along the +x axis. If it came out negative then the direction is along the -x axis.

Ok, so regardless of time, it will be based on the equation mentioned. Thanks for the clarification.

 

[Heat]

ok, here's another.

As we know we solved the at what time is the truck first time a distance of 10.0 cm from its starting point.

It asked me for the second time. I used the second answer I got from the quadratic equation which is 25.8s.

Now its asking me for the third. The quadradic only gave me two answers.

So I did the following: 25.8-6.20 = 19.6 difference...so 25.8+19.6 = 45.4.

Would it not follow the same trend is all variables remained the same?

 

[Doc Al]

Now its asking me for the third. The quadradic only gave me two answers.

Now it's time to use what learningphysics mentioned earlier: 10 cm from the start could be 50 +10 or 50 -10 cm.

 

[Heat]

I would like to thanks Doc Al, learningphysics and G01for their kind contribution.