Daughter's Pre Algebra Problem Has Us Baffled

Our 12 yr old daughter is currently very upset because she's unable to complete a math problem. They just started pre algebra (6th grade) and she's very bright, however she can be tough on herself if she is not perfect or struggles on something.

For context : She asked the teacher for help and the teacher said she was sure she could figure it out. Made her come home with it. She's done all of the non word problems perfectly fine. Stuck on this. We tried to help previously - couldn't. Tried again tonight and still can't. She's stuck trying it out and is getting very frustrated.

If someone could please help us out, we will make sure that she completes it on her own with some help from us. As parents we are not sure where to start and at 40 and 42 we are far from when we learned it ourselves. Thanks so much for any help you may be able to give.

The problem: I wrote t squared so you knew what I mean with the ^2).

Due to gravity, an object falls 16t² (t squared) feet in t seconds. You drop a rock from a bridge that is 75 feet above the water. Will the rock hit the water in 2 seconds? Explain.