Question

PART A) The acceleration of gravity is 9.8 m/s^2 What is the magnitude of the net force on a(n) 82 kg driver operating a dragster as it accelerates horizontally along a straight line from rest to 67 m/s in 8.4 s? Answer in units of kN

PART B) The tension in a string from which a 7 kg
object is suspended in an elevator is equal to 74 N. What is magnitude of the acceleration a of the elevator? The acceleration of gravity is 9.8 m/s^2 Answer in units of m/s^2

Answer 1

0.654 kN

Step-by-step explanation:

If the driver accelerates from rest to 67 m/s in 8.4 seconds, then the magnitude of the acceleration is:

a = (67 - 0)/ 8.4 = 7.976 m/s^2

Then the net force on the 82 kg driver is:

F = m * a = 82 * 7,976 = 654 N

Therefore, in kN the force's magnitude is: 0.654 kN