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

Answer:

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#