A net force of 3 N produces an acceleration of 2m/s^2 on an object of unknown mass.

Question

A)what is the mass of the object?

B)if the net force increases to 4N what is the acceleration of the object?

C)using this the force and acceleration described in part b, what is the velocity of the object after 2seconds and 6 seconds?(assume the object is initially at rest?

Answer 1

This problem makes use of the equation F = ma where F is the applied force, m is the mass, and a is the acceleration.

A. Solve F=ma for m. This gives m = F/a = 3 N / 2 ms^-1 = 1.5 kg.

B. a = F / m = 4 N / 1.5 kg = 2.7 ms^-1

C. V = at = 2.7 ms^-1 x 2s = 5.4 m/s and V = 2.7 ms^-1 x 6 s = 16.2 m/s