EXAMPLE:
A horizontal rope is tied to a 58.0kg box on frictionless ice. What is the tension in the rope if:
1)The box is at rest?
Sol: T=0 N

2)The box moves at a steady vx = 6.00m/s ?
Sol: T=0 N

3)The box vx= 6.00m/s and ax= 5.60m/s^2 ?
Sol: T=325N

QUESTION:
A horizontal rope is tied to a 49.0kg box on frictionless ice. What is the tension in the rope if:
1)The box is at rest?
Sol: T=0 N

2)The box moves at a steady vx= 4.20m/s ?
Sol: T=0 N

3)The box vx= 4.20m/s and ax= 5.60m/s^2 ?
Sol: T=????????????N

$$NOTE:plz answer the question (part3). I already did the first two, so I just need part3. I want to make it easier for you so that I post an example with its answer. you notice its the same question but different numbers, so plz answer the question correctly