Answer:
Step-by-step explanation:
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Systems of equations by substitution
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Answer:
Final potential energy = 24 Joule
The velocity with which object must be thrown = m/s
Step-by-step explanation:
<u>Given:</u>
Mass of object, m = 0.30 Kg
Height of object, h = 8 m
Acceleration due to gravity, g = 10
a) Formula for Potential Energy:
Where m is the mass of object
g is acceleration due to gravity and
h is the height of object
Putting the values of m, g and h
b) Formula for initial and final velocity:
where v is the final velocity
u is the initial velocity with which the object is thrown
g is acceleration due to gravity and
h is the height obtained by object
here v = 0 at the height 8 m because it will come to rest at the point it attains the maximum height.
h = 8m
g = -10 (negative because the object's velocity is decreasing)
Putting the values to find 'u':