If a 0.75kg bullet made a 3.0kg block swing to change its height 0.5 meters, how fast was the bullet traveling? (i solved & 15.7 m/s is incorrect for some reason? )

What are atoms of the same element with varying number of neutrons

A250-n box is at rest on a frictionless horizotal floor. then a person shoves the box with a non-zero force of magnitude p. which statement best describes the relationship betweeen p and the motion of the box after it was shoved? -the box will not move when p< 250n but otherwise will accelerate at a constant rate that is directly proportional to p - the box will begin moving at a speed that is directly proportional to p, then will gradually slow to a halt -the box will move with constant velocity at a speed that is directly proportional to p -box will accelerate across the floor at a constant rate that is directly proportional to p

Which accurately compares concave and convex lenses?