Question

Striking a fixed object at 60 MPH is the same as falling from a _____ story building:

Answer 1

4 story building ............

Answer 2

speed of the striking object is given as

$v = 60 mph$

now this speed in SI units given as

$v = 60 \times \frac{1609 m}{3600 s}$

$v = 26.82 m/s$

So here we can use kinematic now to find the height from where it is dropped

so here we will have

$v_f^2 - v_i^2 = 2 a d$

now we have

$v_f = 26.82 m/s$

$v_i = 0$

$a = 9.81 m/s^2$

now from above equation

$26.82^2 - 0 = 2(9.81)d$

$d = 36.67 m$

now we know that average height of 1 story building is 3 meter

so approx total number of stories in the building will be

$N = \frac{36.67}{3} = 12 story$