During a trail race, a runner is moving at a velocity of 5 meters per second. He comes to a hill and begins to slow down uniformly for 5 seconds until he is running at 1 meter per second. What is the acceleration of the runner during these 5 seconds?
A
0.2 m/s2
B
-0.2 m/s2
ООО
с
0.8 m/s2
D
0.8 m/s2

solution:

→c= a b , that is product of a and b is possible only when when a is m × n matrix and b is n × p matrix.

that is, number of columns of a= number of rows of b.

so, size of matrix , c= a b is , if a = (m × n)matrix

b= (n × p)matrix

then a b = [ (m × n)matrix] ×[   (n × p)matrix ]

→→c= a b= [m × p ] matrix

→→size of product a b will be equal to = number of rows of a × number of columns of b

b

step-by-step explanation:

use distributive property on all like terms and change your signs if you have a double negative or if you have positive/negative