I don't think that 4m has anything to do with the problem.
anyway. here.
A___________________B_______C
where A is the point that the train was released.
B is where the wheel started to stick
C is where it stopped
From A to B, v=2.5m/s, it takes 2s to go A to B so t=2
AB= v*t = 2.5 * 2 = 5m
The train comes to a stop 7.7 m from the point at which it was released so AC=7.7m
then BC= AC-AB = 7.7-5 = 2.7m
now consider BC
v^2=u^2+2as
where u is initial speed, in this case is 2.5m/s
v is final speed, train stop at C so final speed=0, so v=0
a is acceleration
s is displacement, which is BC=2.7m
substitute all the number into equation, we have
0^2 = 2.5^2 + 2*a*2.7
0 = 6.25 + 5.4a
a = -6.25/5.4 = -1.157
so acceleration is -1.157m/(s^2)
Answer:
kinetic energy
The average kinetic energy of water particles. Explanation: As it mentioned Temperature 45°, this clearly specify we are talking about kinetic energy of water particles, as temperature is nothing but the average of kinetic energy of particles randomly moving in water.
When you first learn some information, the first place it goes in your brain is to your short-term memory. So, you read something, or hear something, and it stays in your short-term memory for a little while. If you don't hear it again, or that information doesn't get repeated, it is likely to disappear from your memory - you will forget it. However, the more you repeat that information, the more likely it is that it will be remembered, that is, it will enter your long-term memory and stay there for a long time.
Hope this helps :)
A: 132.9w because 2525\19 is how much energy transferred per second which is also known as the power
Answer: Distance
Explanation: because with force and distance we can determine work, and with work and time we can determine power.