please solve both questions step-by-step Example (1a): A 4.80-kg object is throw
ID: 1863521 • Letter: P
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please solve both questions step-by-step
Example (1a): A 4.80-kg object is thrown vertically downward with an initial velocity of 10 m/s from the roof of 25.0-m-tall building a- Find the work done by the gravity on the object b- Use the work-energy theorem to find the final speed of the object. Example (1b): A 4.80-kg object is thrown vertically upward with an initial velocity of 10 m/s from the roof of 25.0-m-tall building a- Find the work done by the gravity on the object. b- Use the work-energy theorem to find the final speed of the object.Explanation / Answer
1(a)
a.
Workdone by gravity= mgh= 4.8*9.8*25= 1176 J
b. Using conservation of energy
Total energy at top= total energy at bottom
0.5 mu^2+ mgh= 0.5 mv^2
0.5*4.8* 10*10 + 1176= 0.5*4.8* v^2
v= 24.29 m/s
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1(b) same as above
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