A 3 kg object is at rest on a frictionless surface. A force of 9 N is applied. W
Practice Questions
Q1
A 3 kg object is at rest on a frictionless surface. A force of 9 N is applied. What is the final velocity after 3 seconds?
1 m/s
2 m/s
3 m/s
4 m/s
Questions & Step-by-Step Solutions
A 3 kg object is at rest on a frictionless surface. A force of 9 N is applied. What is the final velocity after 3 seconds?
Correct Answer: 9 m/s
Step 1: Identify the mass of the object, which is 3 kg.
Step 2: Identify the force applied to the object, which is 9 N.
Step 3: Use the formula for acceleration, which is a = F/m.
Step 4: Substitute the values into the formula: a = 9 N / 3 kg.
Step 5: Calculate the acceleration: a = 3 m/s².
Step 6: Identify the initial velocity (u) of the object, which is 0 m/s since it is at rest.
Step 7: Use the formula for final velocity, which is v = u + at.
Step 8: Substitute the values into the formula: v = 0 + (3 m/s² * 3 s).
Step 9: Calculate the final velocity: v = 9 m/s.
Newton's Second Law of Motion – This law states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass.
Kinematics – The equations of motion that relate displacement, velocity, acceleration, and time.
