For which angle 0 is cos 0= -1?

cos 540° = - 1

hope it was helpful :))

a. 12.5 kg

step-by-step explanation:

f = ma

so

m = f/a = (2500 n)/(200 m/s²) = 12.5 kg

1 n = 1 kg·m/s²

this may not be at all, but i use the same website you're using for school, and if i'm stuck doing one of these i try to look for it on the section.