Answer:

Explanation:
From work energy theorem
Work done by all forces = Change in kinetic energy
Lets take
m= mass of object
h=height from the ground surface
initial velocity of object = 0 m/s
The final velocity of object is v
Work done by gravitational force = m g . h
The final kinetic energy = 1/2 m v²
So
Work done by all forces = Change in kinetic energy
m g h = 1/2 m v² - 0
v² = 2 g h

We can use the formula Vf^2= Vi^2 + 2ad.
So,
Vi = 0 since we are dropping the object
Therefore,
Vf^2 = 2 (9.8) (49)
You can do the calculator work.
Answer:
0 m/s^2
Explanation:
Acceleration is the change in velocity / time
=> In this case there isn't any change in velocity
=> It is = to 0.