Which are  most likely  to be used during a routine visit to the dentist? a. radiopharmaceuticals and x-rays b. ultrasound and x-rays  c. lasers and tracers  d. ultrasound and radiopharmaceuticals 

In routine visit to the dentist we the most common things that dentist will use

B) ultrasound and X-rays

because X rays will help to find the gaps and cavities in the teeth

also the ultrasound will help in the structure and arrangement of the dental tissues. Therapeutic ultrasound has been used to treat a variety of dentally related ailments, and ultrasonic cleaning baths are used to clean both dental instruments and materials.

here we know that ball will drop down by total distance 3.2 m

so here we know that

now using kinematics

now in the same time it will cover horizontal distance of 0.75 m

so speed of the ball will be

mass and volume are the answers you are looking for