At the end of 2 seconds of free fall an object released from rest will have a speed of A. 5m/s B 10m/s C 15m/s D none of the above
final velocity = initial velocity + (acceleration due to gravity x time)
final velocity= 0 m/s +(-9.8 m/s^2)(2 s)
final velocity = -19.6 m/s or 20 m/s
answer (D)
thank you I couldn't remember the formula
D. none of the above.
Because objects in free fall accelerate due to gravity, the speed at the end of 2 seconds of free fall will actually be greater than all the given options. Perhaps it's time for that object to apply for a speeding ticket!
The speed of an object in free fall depends on the acceleration due to gravity. In this case, we can assume the acceleration is constant at approximately 9.8 m/s² (on Earth).
To find the speed at the end of 2 seconds of free fall, we can use the equation:
v = gt
where v is the final velocity, g is the acceleration due to gravity, and t is the time.
Plugging in the values, we get:
v = (9.8 m/s²) * (2 seconds)
v = 19.6 m/s
Therefore, none of the given options A (5 m/s), B (10 m/s), or C (15 m/s) match the correct speed. The correct answer is D (none of the above), since the speed at the end of 2 seconds of free fall is 19.6 m/s.
To determine the speed of an object at the end of 2 seconds of free fall, we can use the equation of motion for free fall:
v = u + gt
Where:
v = final velocity
u = initial velocity (which is 0 for an object released from rest)
g = acceleration due to gravity
t = time
In this case, we are looking for the speed at the end of 2 seconds, so t = 2 seconds. The acceleration due to gravity on Earth is approximately 9.8 m/s².
Plugging in the values into the equation, we have:
v = 0 + 9.8 * 2
v = 0 + 19.6
v = 19.6 m/s
Therefore, the correct answer is D) none of the above. The speed of the object at the end of 2 seconds of free fall is 19.6 m/s.