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skad [1K]
3 years ago
9

a baby carriage is sitting at the top of a hill that is 21m high. the carriage with the baby weighs 25kg. calculate the speed th

e carriage the carriage would have if it rolls down the hill
Physics
1 answer:
Ulleksa [173]3 years ago
3 0

Answer:

Velocity = 20.3 [m/s]

Explanation:

This is a typical problem of energy conservation, where potential energy is converted to kinetic energy. We must first find the potential energy. In this way, we will choose as a reference point or point where the potential energy is zero when the carrriage rolls down 21 [m] from the top of the hill.

E_{p} =m*g*h\\ where:\\m = mass = 25[kg]\\g = gravity = 9.81 [m/s^2]\\h = elevation = 21 [m]\\E_{p} =potential energy [J]\\E_{p} =25*9.81*21=5150[J]

Now this will be the same energy transformed into kinetic energy, therefore:

E_{p}=E_{k} = 5150[J]\\E_{k} =0.5*m*v^{2} \\where:\\v=velocity [m/s]\\v=\sqrt{\frac{E_{k}}{0.5*25} } \\v=20.3[m/s]

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