Question

Old Isaac took a little nosedive from his perch on top of the building, 25 feet above ground. Given that he fell as a result of a gentle tap to his noggin (initial velocity was zero), how fast is Isaac traveling when he hits the ground? (In case you forgot, acceleration due to gravity is -32 ft/sec2 .) Make sure your answer is in feet/sec. Leave your reply under the brick beside your car.

Answer 1

40 ft/s

Step-by-step explanation:

t = Time taken

u = Initial velocity

v = Final velocity

s = Displacement

g = Acceleration due to gravity = -32 ft/s² = a (downward is taken a negative)

Equation of motion

`v^2-u^2=2as\\\Rightarrow v=√(2as+u^2)\\\Rightarrow v=√(2* -32* -25+0^2)\\\Rightarrow v=40\ ft/s`

The speed of Isaac as he reached the ground is 40 ft/s