If the pitch of a sound decreases and the sound source is moving, is the sound source moving toward or away from the observer?

Janelle made a hypothesis bout the uneven temperatures inside her house during winter. she believes that 50% of the ducts are blocked and she plans to investigate. if she wants to prove her hypothesis using scientific processes what should she do next?

The image shows a pendulum in simple harmonic motion the pendulum starts at a and swing to e

An object moves from position +34m to the position -15m in 15 seconds. what is the total displacement? what is the total velocity?