Using the data you obtain, find the speed of the wave for each of the readings. Recall that speed = d/t​

i think the answer is a, hope this is right, that would be my best guess.

c) up is the direction the magnetic force is acting on the charge.

initial speed when it is dropped is 150 ft/s

now at the same moment the acceleration due to gravity is perpendicular to its velocity

so as we know that

now we have centripetal acceleration a = 32 ft/s^2 as its perpendicular to velocity

while tangential acceleration at the same moment will be zero

so

now radius of curvature is given as

so the radius of curvature just after it is dropped is 703.125 ft

3. dark matter

empty space could also be a simple vacuum