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@Michele_Laino This is like basic physics.

velocity is defined as speed and direction

I think that we can only say that the magnitude of our velocity is 40 Km/h

namely, the motion of our car can be a uniform circular motion

So is it a yes?

yes! That's right!

I have more questions, since I like to make sure many things. :)

ok!

What two controls in a car can use a change in speed?

So do i write the two pedals (gas and brake) and the steering wheel?

yes! I think so!

Acceleration? right?

Yes that's what I thought. But I am not quite sure.

change in velocity over time*

yes! I think so, since the acceleration, as a number, is the change in speed

@alekos I think you are correct considering it is only asking for change in speed.

you are right! @alekos

What is the acceleraiton of a car that travels in a straight line at a constant speed of 100km/hr?

the acceleration would be 100km/hr since it is travels in a straight line

if it is at a constant speed of 100km/hr there is no change in velocity so 0/t = 0

Oh okay

the velocity must change over a specific period of time to find a acceleration value

the acceleration as a vector quantity, since the motion is along a straight line, is the null vector

Yes that's why i deleted it

we have:
100 Km/h= 27.78 m/sec
so acceleration is:
27.78/10=2.778 m/sec^2

yeah i was overlooking the "per hour" thank you for correcting that

after a time t (seconds), the requested change is
2*t Km/h

I don't quite understand

ansur at my fb :https://www.facebook.com/ParthKohli

What does
\[a \Delta t\] mean

Moving on to the next question:
Why does the unit of time never twice in the unit of acceleration?

\[a\Delta t\]
is the change in speed

So how would i calculate the speed?

here we have to apply this formula:
\[v = a\Delta t = 5 \times 3 = ...m/\sec \]

so for this question would we do:
\[V_f = V_i + (acceleration \times time)\]

yes! nevertheless the initial speed is zero, since the skateboarder is starting from the rest

V_i = 0 (initial velocity)
acceleration = 5 m / s^2
time = 3 seconds
\[V_f = 0 + (5 \times 3)\]

that's right!

15 m/s ?

yes!

bycicle goes from 0 to ?

10km/hr
Sorry

So these are both the same right?

sorry for my english:
bicycle*

yes! They are the same

I still didn't get it :(

in our case, we have:
\[a = 2\frac{{Km/h}}{{\sec }}\]

So the answer itself is 2km/hr ?

yes!

since we have to divide by 3.6, namely
100/3.6 = 27.78 (approximated value)

why 3.6?

therefore:
\[1\frac{m}{{\sec }} = 3.6\frac{{Km}}{h}\]

Oh okay!

I'am available from 16:00 (Italy time zone)

Well I am in NY so what would be the time in EST?

I think 16-6= 9:00 am

sorry:
16-6= 10:00 am

oh okay so it's like 8pm in italy now?

yes! at the moment it is 19:57 from me

you use the military time a lot?

or the 24 hour standard clock?

I use the standard 24 hour clock

okay b/c i use am and pm. anyway, thank you so much for your help. i REALLY appreciate it :)