Step-by-step explanation:
(a) The gravitational potential energy of the coin above the ground level is given by :
Where
m is mass of the object
g is acceleration
h is height
The kinetic energy of the coin when travelling at a speed v is given by :
(b) The coin is dropped from the top of a building of height 380m. Let v the speed of the coin as it hits the ground. Using the conservation of energy.
Hence, this is the required solution.