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 * (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 = (36.67)/(3) = 12 story`