Answer to Question #12656 in Mechanics | Relativity for mohamed
An object of 6 kg mass was at rest. After that a 30 N force is imposed on it. What will be
kinetic energy after 10 sec time?
Let's find the acceleration of an object using the second Newton's law:
F = ma ==> a = F/m = 30N /6kg = 5 m/s².
The velocity of an object after 10 seconds will be
V = at = 5m/s² * 10s = 50m/s.
So, the kinetic energy of an object after 10 seconds will be
E = mV²/2 = 6kg * (50m/s)² /2 = 7500J.