Conceptual Physics Questions?

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If a 100 g mass is dropped instead of a 200 g mass would you find a different value for the acceleration due to gravity? Explain.

A compact body is thrown vertically downward with a speed of 10 m/s from the roof of a building that is 20 meters high. Neglecting air resistance, what is the acceleration of the body? How long does it take the body to reach the ground? What is the velocity of the body upon impact?

Do previous question again this time with the body thrown upward at 10 m/s.


Can you guys please help me? I will do something niceeee for youuuu.
 
1. NOOOOOOO!!!! don't fall for this. acceleration due to gravity is constant on earth NO MATTER HOW HEAVY IT IS. even though you would think it would be more it's still 9.8 m/s^2, i'm still not sure as to why just know that it is, or even experiment with it yourself.

2. 3.acceleration is still acceleration due to gravity or 9.8m/s^2

since there is no force besides gravity acting on the ball while it is moving, the acceleration will always be 9.8m/s^2 in the downward direction

2. V1^2 = V0^2 + 2A * (X1-X0)
V0 = -10
A= -9.8
X1-X0 = -20

v1^2 = -10^2 + 2*(9.8)*(20) = 492
sqrt(492) = 22.18
Velocity when it hits the ground = 22.18

V1= V0 + A*T1

V1 = 22.18
V0 = -10
A= -9.8

22.81 = -10 +9.8*T1
add 10
32.81= 9.8*T1
divide by 9.8

32.81/9.8 = T1
3.34 = T1

for the second one just replace all the -10's with positive tens and find the answer again. (Velocity will be the same though)
 
the answer to the first one is that the acceleration due to gravity is always 9.8m/s^2.
 
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