(see image) what triangle must be a right triangle and

D. is right angle because ⊥ CC'.

Step-by-step explanation:

Given A figure  in which line EG is perpendicular to Segment CC'

Therfore , is a right angled triangle because in which

A right angled triangle is that type of triangle in which one angle is of 90 degree .Then ,we say the the triangle is a right angled triangle.

Now , we can see from the given figure  in line EG is perpendicular is given . Hence, we are given

,

Hence, we can say the triangle BGC is a right triangle.

Now, we check given option

A. It is false. Because no information about the triangle A'B'C' .In given statement the triangle A'B'C' is the reflect image of the triangle ABC .So we can not say is a right angle .

B. ADC is a right triangle because  intersect AC at C.

It is false.Because  we can see from given the figure AC not meet in given figure.

C. is a right triangel  because B lies of the reflection .It is false.Because we can't say that BCC' is a right angle if B lies of the reflection.

D. is a right triangle  because

It is true.  Because EG is perpendicular it means . Hence, we can say triangle BGC is right triangle.

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