An object travels 7.5 m/s toward the west. Under the influence of a constant net force of 5.2 kN, it comes to rest in 3.2 s. What is its mass?
A) 2200 kg
B) 1600 kg
C) 1100 kg
D) 690 kg

Question

Quizplus · Accepted Answer

The correct answer is A because:The force acting on the object is:F = mawhere:F is the force in newtonsm is the mass in kilogramsa is the acceleration in meters per second squaredThe acceleration of the object is:a = v/twhere:v is the velocity in meters per secondt is the time in secondsThe velocity of the object is:v = 7.5 m/sThe time it takes for the object to come to rest is:t = 3.2 sSubstituting these values into the equation for acceleration, we get:a = 7.5 m/s / 3.2 s = 2.34 m/s^2Substituting the values for force, acceleration, and mass into the equation for force, we get:5.2 kN = m * 2.34 m/s^2Converting kilonewtons to newtons, we get:5.2 kN = 5200 NSolving for mass, we get:m = 5200 N / 2.34 m/s^2 = 2222.22 kgRounding to the nearest hundred kilograms, we get:m = 2200 kg

An Object Travels 7