Asimple pendulum of mass m swings at the end of a string of length ℓ. the highest point the pendulum reaches is a distance d vertically above its lowest point. in terms of these quantities, what is the kinetic energy of the pendulum when it reaches its lowest point?

mgd

Explanation:

length of the string is l.

Height raised is d from the lowest point.

By the conservation of energy

Potential energy at the height is equal to the kinetic energy.

m x g x d = Kinetic energy

So, the kinetic energy at the lowest point is mgd.

a sonic boom is a loud boom that breaks the sound barrier

explanation: