Question

@ProfBrainstorm @ProfBrainstorm Excuse me, could you help me with three physics problems? Two of them I did already; I need someone to check my answers, and the last one I somewhat started. Thank you @ProfBrainstorm

Answer 1

I think you have parts 1 and 2 correct - the dog was already in the car in part one I'm assuming ?
Yes, for part 3 you can use F=mv^2/r to find the tension in the string.

Answer 2

The negative velocity in part 2 just means that jesse's car was coming towards jenny.
In part 3, tension is a force and so the unit will be Newtons. You have the right number.

Answer 3

Thank you, you were so helpful! :)