Question

Determine the kinetic energy of the body of mass 90 kg moving with a speed of 200 m/s.

(a) 15000 Joules

(b) 900000 Joules

(c) 21000 Joules

(d) 40000 Joules

I had been asked this question in examination.

My question comes from Energy Equation in section Aerodynamics – Fundamental Principles and Equations of Aerodynamics

Answer 1

Correct option is (b) 900000 Joules

The explanation: KE=0.5*m*v^2.

Substitute the values in the formula.

Here, m=90 kg and v= 200 m/s.

On solving the above equation we get,

KE=0.5*90*(200)^2= 900000 Joules.