Question

what is the best form of measurement to find the time it takes for a dropped object to hit the ground?
options:
stopwatch
scone
kelvin

what is the best form of measurement to find the mass of a chemical added to a beaker?
options:
kg
pounds
ounces
grams

Explanation:

First Question (about measuring the mass of a chemical)

To find the mass of a chemical, the appropriate unit should be considered. Grams (g) is a standard unit for measuring mass, especially for small quantities of chemicals in a laboratory setting. Pounds are more for larger, everyday mass measurements, ounces are also for smaller but less precise (in lab context) mass, and liters are for volume, not mass. So grams is the best unit here.

To measure the time it takes for a dropped object to hit the ground, we need a unit of time. Seconds are the appropriate unit for such short - duration events (as the time for a dropped object to fall is usually in seconds). Hours are too long, and kilometers are a unit of distance, not time.

Answer:

A. g (grams)

Second Question (about measuring time for a dropped object to hit the ground)