A cat, also of weight 43.0 N, falls asleep on top of block A. If block B is now set into downward motion, what is its acceleration magnitude?

4.3kg

Explanation:

A cat, also of weight 43.0 N, falls asleep on top of block A. If block B is now set into downward motion,

Weight is a product of mass and acceleration due to gravity. Weight is also a downward force upon a body.

From newton's second law of motion which states that the rate of change of momentum of a body is proportional to the applied force which takes place in the direction of force applied.

This law gives a formula which relate force, mass and acceleration.

Force = mass x acceleration due to gravity (g)

Given that force = 43N , g= 10m/s2

Since force(F) weight = mass(m) x acceleration due to gravity (g)

Therefore W = mg

Divide both sides by g

W/g = mg/g

Therefore,

Mass)  = W/g

Mass = 43N ➗ 10m/s2

Mass= 4.3kg

The S. I unit of mass is kilogram (kg)

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your answer is c! hope this : )