Author Question: At the same moment from the top of a building 3.0 102 m tall, one rock is dropped and one is thrown ... (Read 109 times)

strangeaffliction · **on:** Jul 29, 2018

At the same moment from the top of a building 3.0 102 m tall, one rock is dropped and one is thrown downward with an initial velocity of 10 m/s. Both of them experience negligible air resistance.

How much EARLIER does the thrown rock strike the ground? A) 0.95 s
B) 0.86 s
C) 0.67 s
D) They land at exactly the same time.

Question 2

An electron is moving with the speed of 1780 m/s. What is its de Broglie wavelength?

A) 409 nm
B) 302 nm
C) 205 nm
D) 420 nm
E) 502 nm