When a toy truck collides into a toy car, the momentum of is the same before and after the collision.
a. the truck
c. the truck times the car
b. the car
d. the truck plus the car?

d. the truck plus the car

Step-by-step explanation:

The law of conservation of momentum states that the momentum before collision is equal to the momentum after collision.

As such the addition of the momentum (the product of the mass and velocity) of the car and that of truck before collision is equal to the product of the sum of the masses of the car and truck and the velocity with which both move after collision.

The right answer is the truck plus the car.

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step-by-step explanation:

for the friend request.

when a figure, such as triangle (xyz) is reflected over the line y = x to create x'y'z' the x-coordinates and y-coordinates of the original image (pre-image) will be reversed for the image. (e.g., (x, y) > (y, x)) this means that the pre-image position of the x- and y-coordinates switch places which in turn provides a mirror like image of the original xyz.  

i notice that when i draw a line segment from x to x', that the points are parallel from each other -- they are exactly across from each other and do not intersect with any other points.  

yes, think i would see the same characteristic if you drew the line segment connecting y with the reflecting line and then y' with the reflecting line because of the essence of reflections. because it is a mirror image, each point was effected the same way which leads me to conclude that they same would apply to y and y'.