Question

While Bob is demonstrating the gravitational force on falling objects to his class, he drops an 1.0 lb bag of feathers from the top of the science building. Determine the distance the bag has traveled after falling for 1.5 seconds assuming it has reach free fall and given the gravitational acceleration of 9.8 m/sec2.
A) 7.4 m
B) 11 m
C) 15 m
D) 22 m

Answer 1

Answer:

Option B, 11 m is the correct answer.

Explanation:

We have equation of motion ,$s=ut+\frac{1}{2} at^2$ , s is the displacement, u is the initial velocity, a is the acceleration and t is the time.

In this case u = 0 m/s , t = 1.5 seconds , a = acceleration due to gravity = $9.8m/s^2$ , we need to find displacement

Substituting

 $s=0*1.5+\frac{1}{2} *9.8*1.5^2\\ \\ s=11.025m$  

So option B, 11 m is the correct answer.