Question

1. I drop a penny from the top of the tower at the front of Fort Collins High School and it takes 1.85 seconds to hit the ground. Calculate the velocity in m/s after 1.10 seconds of freefall and calculate the velocity at impact in mi/hr.

Answer 1

what is the height of Fort Collins High School?

If found, use the formula, V=x/t-----------------(x=distance; t=time)

Answer 2

You have three known variables:

Acceleration - $9.8m/s^2$
Time - $1.85s$
Initial Velocity - $0m/s$

For the first part of your question:

$v = u + at v = (0)+(9.8)(1.1) v = 10.78 m/s v=11 m/s (2 significant figures)$

For the second part of your question:

$v=u+at v=(0)+(9.8)(1.85) v=18.13 m/s$

This still needs to be converted to m/h:

$18.13m/s = 18.13\times 3600 metres/h=65628 metres/hour 65628 metres/hour = 65628\div1600 mi/h = 40.7925 mi/h = 41 mi/hr (2 significant figures)$