An object moving at 30 m/s takes 5 sec. to come to a stop. What is the object’s acceleration

In which situation has the independent variable for the experiment been changed? check all that apply. changed from counting the number of duckweed at day 0 and day 14 to counting them every day changed from testing duckweed growth in beakers to testing duckweed growth in large outdoor tanks changed from testing the effect of ph on duckweed growth to testing the effect of light levels on duckweed growth changed from testing the effect of acid ph on duckweed growth to testing the effect of basic ph on duckweed growth

What is the weight of a feather (mass = 0.0001 kg) that floats through earth's and the moon's atmospheres?

Why does the liquid rise up through the dip tube when the valve is open