Read the sentences.
the wind whipped the branches into a frenzy. it looked like the tree was doing a crazy dance. which revision correctly uses a subordinating conjunction to combine the sentences?
a. the wind whipped the branches into a frenzy, so that, it looked like the tree was doing a crazy dance.
b. the wind whipped the branches into a frenzy until it looked like the tree was doing a crazy dance.
c. the wind whipped the branches into a frenzy, and it looked like the tree was doing a crazy dance.
d. the wind whipped the branches into a frenzy; consequently, it looked like the tree was doing a crazy dance.

B. The wind whipped the branches into a frenzy until it looked like the tree was doing a crazy dance.

A subordinate conjunction provides a transition between a dependent clause and an independent clause. Options C and D are not correct because they do not have a subordinate conjunction. The sentences combined are both independent clauses. They don't rely on each other to be a complete thought. Option A is also wrong. Subordinate conjunctions should not be surrounded by commas. If a comma is necessary, it should be before the subordinate conjunction or after the dependent clause. Option B is the only one that uses a subordinate conjunction (until) correctly.

the boy's acceleration toward the girl is 2.08 m/s^2.

explanation:

according the newton's third law, the force causing the girl accelerate towards the boy will be me with equal counter-force causing the boy to accelerate towards the girl. these forces will be of equal magnitude and allows us to determine the boy's acceleration:

the boy's acceleration toward the girl is 2.08 m/s^2.