A Ball is thrown horizontally from a point 24m above the ground strikes the ground after traveling horizontally a distance of 18m. With what speed was it thrown? A) 8.1m/s
B) 8.9m/s
C) 7.4 m/s
D) 6.1m/s

Can someone please help me with this question? And explain a bit! Thank you!!!

Aboxcar traveling at 12 m/s approaches a string of 5 identical boxcars sitting stationary on the track. the moving boxcar collides and links with the stationary cars and they all move off together along the track. what is the final speed of the cars immediately after the collision? (you may take the mass of each boxcar to be 18,537 kg.)

What is the final velocity of the initial velocity of 25 and -50?

Avery long solenoid of inner radius 2.75 cm creates an oscillating magnetic field of the form = for this solenoid, =0.00425 t and =319 rad/s. (a)what is the maximum value of the induced electric field at a perpendicular distance 1.45 cm from the axis of the solenoid? (b) what is the maximum value of the inducted electric field at a point 5.85 cm perpendicular from the axis of the solenoid?