Please check my solution (pulling a dog in a toy wagon)

[Special One]

Homework Statement

1D motion

Relevant Equations

Newton’s law

Question sheet is attached

answer of 1st question:

Answer of 2nd question:

 

[PeroK]

Looks like you've got the right idea.

120kg? That's a heavy dog!

 

[etotheipi]

It's probably this absolute unit

 

[PeroK]

That's what my grandmother would have called "a great muckle brute o' a thing".

 

[kuruman]

I think it's two people in a very realistic dog suit. Look at its front paws; they're the size of human feet.