What is the kinetic energy of an object with a mass of 2 kg that has been in freefall for 5 s?

1 Answer
Apr 9, 2018

2401 Joules, approx 2.4kJ

Explanation:

Assuming g=9.8m/s^2, initial velocity is zero and NO air resistance.

Use equation d=V_i*t+1/2at^2 to find distance:
d=4.9*(5^2)
d=122.5m

Now gravitational potential energy:

E_g=mgh
E_g=2kg*9.8m*s^-2*122.5m
E_g=2401J