From this Question A ball begins in the middle of a cart. The cart is quickly moved and the ball ends up against the right lip of the cart.

A. Which way was the cart moved?

B. Why did the ball end up at the right end of the cart? before after ball

Year  1936,  lehman predicted that the earths 'inner core' is solid. she observed that the seismic signals during her study were bent and did not pass through instead bouncing back. later it was confirmed that the earth's inner core was solid made up of nickel-iron and had a molten outer core.