A child and sled with a combined mass of 50 kg, start from rest and slide down a frictionless hill that is 7.5 meters high. what
is the mechanical energy of the sled at the top? what is the mechanical energy of the sled at the bottom? what is the speed of the sled at the bottom of the hill
The mechanical enegia is the sum of the kinetic energy plus the potential energy Kinetic energy = (1/2) * m * v ^ 2 Potential energy = m * g * h Mechanical energy = (1/2) * m * v ^ 2 + m * g * h What is the mechanical energy of the sled at the top? Mechanical energy = (1/2) * m * v ^ 2 + m * g * h Mechanical energy = (1/2) * (50) * (0) ^ 2 + (50) * (9.8) * (7.5) = 3675 Mechanical energy = 3675J What is the mechanical energy of the sled at the bottom? By conservation of energy we have that the energy in point 1 is equal to the energy in point 2 Mechanical energy = 3675J What is the speed of the sled at the bottom of the hill? Mechanical energy = 3675J = (1/2) * m * v ^ 2 clearing up v we have (1/2) * (50) * v ^ 2 = 3675 v ^ 2 = 3675 * (2) * (1/50) v = root (3675 * (2) * (1/50)) = 12.12 m / s answer 3675J 3675J 12.12 m / s
