Answer: yeah it is reflection
Hi there!
Recall the equation for weight.

W = Weight (N)
M = Mass (kg)
g = acceleration due to gravity (m/s²)
The weight of an object depends upon its MASS and the strength of the GRAVITATIONAL field. We can solve for weight:

d = displacement
a triangle, displacement = hypotenuse = phytagoras

Answer:
D
Explanation:
because two vectors which align in the same line adds one to another
To find the magnitude of the boy's applied force, use newton's second law (where the force is the mass times the acceleration)
F = ?
m = 24 kg
a = 0.50 m/s^2
F = ma
F = (24 kg) (0.50 m/s^2)
F = 12 N
therefore the magnitude of the boy's pushing force is 12 N