At time t=0, rock a is dropped from rest from a height of 90 m. at the same instant, rock b is launched straight up from the ground level with an initial speed of 30 m/s. write an equation of motion for rock a and b, giving its position at all time.

rock A:

rock B:

g=9.81m/s^2

Explanation:

Kinematics equation:

in our case the acceleration is the gravity and it has a negative direction.

a=-g

rock A, yo=90m, Voy=0m/s:

rock B, yo=0m, Voy=30m/s:

i dont know but

explanation:

whoever your teacher is, deserves a raise for using pokemon as an example

adding a(n) to an electric circuit would increase the magnetic field around a wire;

b. solenoid

a solenoid is a type of electromagnet whose purpose is to generate a controlled magnetic field.

if the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet.