Answer: B
D makes no sense because energy is created so we can remove that. C also makes no sense because if energy is not created how did it get destroyed if there's no energy in the first place. This leaves us with a and B the correct answer is B because energy is created and cannot be destroyed.
Answer:
It has been learned in this lesson that the area bounded by the line and the axes of a velocity-time graph is equal to the displacement of an object during that particular time period. ... Once calculated, this area represents the displacement of the object.
Explanation:
Answer:
Speed of the wreck after the collision is 65 km/h
Explanation:
When a car hits truck and sticks together, the collision would be totally inelastic. Since the both the vehicles locked together, they have the same final velocity.
Mass of car 
Mass of truck 
Initial speed of the car 
Initial speed of the truck 
The final velocity of the wreck will be

since final speed are same, 


Answer:
The time required is 28.5 [min]
Explanation:
We can find the time using the kinematic equation, but first, we must convert the distance to travel in meters.
x = distance = 12 [km] = 12000 [m]
velocity = 7 [m/s]
T![t = \frac{x}{v} \\t=\frac{12000}{7} \\t=1714 [s] = 28.5 [min]](https://tex.z-dn.net/?f=t%20%3D%20%5Cfrac%7Bx%7D%7Bv%7D%20%5C%5Ct%3D%5Cfrac%7B12000%7D%7B7%7D%20%5C%5Ct%3D1714%20%5Bs%5D%20%3D%2028.5%20%5Bmin%5D)