A 65.00-kg runner begins her exercise by moving with a velocity of 2.50 m/s. She then runs up a 5.00-m flight of stairs. At the top of the stairs, she keeps running with a velocity of 1.50 m/s. This entire exercise takes 8.00 s. Determine her output power during the entire exercise. O A.P = 424 w O B. P = 433 W OC.P = 407 W O D.P = 407 J/s

find the work done of the child

Vector A has a magnitude of 13 units and points in the positive x-direction. Then, vector B is added making the vector A + B point in the positive x-direction with a magnitude of 37 units. When C is added, the resultant vector points in the negative x-direction with a magnitude of 21 units. Find the magnitude and direction of C.    58 units in the negative x-direction   31 units in the negative x-direction   16 units in the negative x-direction   34 units in the negative x-direction

Please show all work and answer all parts