Two angles of a triangle each measure 70â°. what is the measure of the third angle in degrees?

40 degrees

Step-by-step explanation:

The three angles of any triangle always add up to 180 degrees.

Thus, since we already know 2 angles which add up to 140 degrees, we just need to subtract the two angles we already know from 180 degrees for the third angle.  

180-140=40 degrees.

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