A parachute on a racing dragster opens and changes the speed of the car from 85 m/s to 45 m/s in a period of 0.1 minute. What is the acceleration of the dragster?

There are multiple tuning forks present in the room, and annie strikes one with a natural frequency of 400 hz. which of these other tuning forks will begin to vibrate through resonance and make the sound louder? a 200 hz tuning fork a 400 hz tuning fork a 800 hz tuning fork a 1600 hz tuning fork