Whats the answer of the problem peter is 3 years older than his sister anna. if times their combined age is 85 . determine annas age

Anna is 41 years old.

Step-by-step explanation:

Easiest way to do this is by building a equation,

Lest say Anna's age is .

Then as Peter is 3 years older than Anna Peter's age should be .

Then the combined ages of the two people is given as 85. So we can write an equation as,

(deducting 3 from both sides of the equation)

As we originally took Anna;s age as

We can say Anna is 41 years old.

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