Which of the following shows constant velocity?
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Ответ:
cool
Explanation:
cool cool cool cool
Ответ:
Potential Energy = 147Joules
KE = 490Joules
Explanation:
1) Potential Energy = mgh
Mass m = 50kg
g = 9.8m/s^2
height h = 3.0m
Potential = 50*9.8*3
Potential Energy = 147Joules
2) KE = 1/mv^2
Get the velocity
v² = u²+2gh
v² = 0²+2(9.8)(1.0)
v² = 19.6
v = √19.6
v = 4.43m/s
KE = 1/2 * 50 *4.43²
KE = 25 * 19.6
KE = 490Joules
Hence the kinetic energy is 490Joules