Aboxer punches a sheet of paper in midair from rest to a speed of 40 m/s in 0.05 s. if the mass of the paper is 0.01 kg, the force of the punch on the paper is?

8N

Explanation:

Givens:

Mass of paper = 0.01 kg

inital speed of paper = 0 m/s (i.e at rest)

final speed of paper = 40 m/s

change in speed = (40 - 0 ) = 40 m/s

acceleration = change in speed / time taken = 40 / 0.05 = 800m/s²

force = mass x acceleration

= 0.01 kg x 800 m/s² = 8N

the total distance that martina travels that day is

(distance from home to mom's office) plus (distance from mom's office to school)

plus (distance from school to library) plus (distance from library to friend's house)

plus (distance from friend's house to martina's house).

(we don't know what any of these distance actually is.)