Question

mission nl.3: unbalanced forces and accelerations
a 12-kg object is moving to the right at a constant velocity of 2 m/s. which one of the following net horizontal forces is required to maintain this state of motion?
a. 6 n
b. 0.166 n
c. 0 n
d. 24 n

Explanation:

Step1: Recall Newton's first law

An object in constant velocity has 0 acceleration.

Step2: Relate force to acceleration

Use Newton's second law: $F_{net}=m \cdot a$
Substitute $m=12\ \text{kg}$, $a=0\ \text{m/s}^2$:
$F_{net}=12 \cdot 0 = 0\ \text{N}$

Answer:

c. 0 N