At the same moment from the top of a building 3.0 102 m tall, ...

[strangeaffliction]

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

[parshano]

Answer to Question 1

A

Answer to Question 2

A

[strangeaffliction]

Thanks for the timely response, appreciate it

[dyrone]

Great answer, keep it coming