Three quarters remain un-decayed
Complete Question
The complete question is shown on the first uploaded image
Answer:
The spring scale
reads 
Explanation:
From the question we are told that
The first force is 
The acceleration by which the cart moves to the right is 
The mass of the cart is m = 3.231 kg
Generally the net force on the cart is

This net force is mathematically represented as

So



Answer:
Joel has the faster speed.
Explanation:
Joel has a steeper slope on the graph. The steeper a slope is, the faster speed will be. Therefore, Joel's slope is steeper which increases overall speed.
Answer:
The magnitude of the acceleration of the box is 2 m/s².
Explanation:
Given:
Mass of the box,
kg
Force acting towards east,
N
Frictional force acting towards west,
N
Let the acceleration be
m/s².
Now, net force acting on the box towards east is given as:

From Newton's second law of motion,

Therefore, the magnitude of the acceleration of the box is 2 m/s².