Which of these toy trains has the slowest speed?
A) Toy train 2 travels 100 cm in 10 seconds.
B) Toy train 3 travels 100 cm in 20 seconds.
C) Toy train 4 travels 200 cm in 10 seconds.
D) Toy train 1 travels 200 cm in 20 seconds.

Aflask with vinegar in it has a mass of 160 grams. a balloon with baking soda in it has a mass of 40 grams. the balloon is attached to the flask to seal the opening and the vinegar and baking soda mixes. the balloon inflates to a large volume. what will the total mass of the balloon and flask be after the balloon inflates? explain. a) less than 200 grams because the solid baking soda disappears. b) 200 grams, because all the atoms remain in the balloon or flask. c) more than 200 grams because the size of the balloon is so much larger. d) less than 200 grams because gases such as the one in the balloon are lighter than solids and liquids.

The strong nuclear force acts over a small distance than the electrostatic force. true or false

The diagram shows a boulder rolling down a hill into a valley and then up the opposite hill. at which position does the boulder have the greatest kinetic energy? ab c d