Some time ago I watched a movie that was sort of a slasher genre movie. One of the opening scenes involved a girl solving a physics problem (like a pendulum or something like that) in front of an examinator, such as pic related. She passes the test and then she goes out to speak to her friends about a party that night. She even greets the future murderer, without knowing his dark intentions. If I'm not wrong, he asks her out but she rejects him jokingly. Later in the movie, he says the same line the she said to mock her. I've been trying to recall the movie's name, but it's been hard. I even tried to figure it out using AI but it was misleading. Do you know what movie matches up the description provided?

>>1533944 (OP)
The Lovely Bones