Answer:A) noble gases
Explanation: key word gas. if you fart it smells and other gases harm.
Answer:
The force required to maintain an object at a constant velocity in free space is equal to Zero.
Initially, the spring stretches by 3 cm under a force of 15 N. From these data, we can find the value of the spring constant, given by Hook's law:

where F is the force applied, and

is the stretch of the spring with respect to its equilibrium position. Using the data, we find

Now a force of 30 N is applied to the same spring, with constant k=5.0 N/cm. Using again Hook's law, we can find the new stretch of the spring:
Answer:
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