calculate the speed with which an object or mass 20kg hits the ground to its kinetic energy of 490 joules (mention formula)

Speed = 7m/s

Explanation:

Kinetic Energy = 1/2*(mv²)

v² = (490*2)/20 = 49

v = √49 = 7m/s

force is mass*acceleration.

we have a very small mass: 11.4*0.001 kg

if we want 0.035n of force, we need an acceleration:

0.035 = 11.4*0.001*a

a = 0.035/(11.4*0.001) m/s^2

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.