#Use this cell to calculate the velocity of a ball after falling 2 meters initialHeight = 2 # meters gravityAccMag = 9.81 #meters/s^2, magnitude of acceleration due to gravity ##### Begin Editing ##### finalVelocity = (2*gravityAccMag*initialHeight)**(1/2) # in meters/s. This should be a vector. ##### End Editing ##### velocityMagnitude = np.linalg.norm(finalVelocity) #numpy.linalg.norm takes the magnitude of an array print('The final velocity of a ball after falling 2 meters has a magnitude of {} meters/second'.format(velocityMagnitude))

#Use this cell to calculate the magnitude of the drag force for a ball that has fallen 2 meters vel = velocityMagnitude*np.array([1./np.sqrt(3),1./np.sqrt(6),1./np.sqrt(2)]) # meters/s print(vel) r = 0.025 # meters ##### Begin Editing ##### A = (3.1416)*(r**2) #m^2 C = 0.5 #unitless rho = 1.204 #kg/m^3 dragForce = (-0.5)*C*A*rho*(vel**2) ##### End Editing ##### dragMagnitude = np.linalg.norm(dragForce) print('The magnitude of the air drag force is {}'.format(dragMagnitude))

#Run this cell without editing print(np.linalg.norm(vel)*vel) print(vel*vel)

#Use this cell to calculate the ratio of the magnitude of the drag force to gravity ##### Begin Editing ##### gravityForce = (0.075)*(gravityAccMag) ##### End Editing ##### gravityMagnitude = np.linalg.norm(gravityForce) ratio = dragMagnitude / gravityMagnitude print('The ratio of the air drag force to gravity is {}'.format(ratio))