If a shopping cart's mass is decreasing while a constant force is applied, what happens to its acceleration? acceleration will go up

Ineed the answers for these promblems i have

You are given two vectors a⃗ =−3.00ι^ 5.00j^ and b⃗ =5.00ι^ 2.00j^. let the counterclockwise angles be positive.

Give one example to show that when substances are mixed, it may result in a chemical or a physical change depending on the conditions.