Here's why:
* Freefall means only gravity acts: The object is only influenced by the acceleration due to gravity (approximately 9.8 m/s²).
* Velocity changes over time: The object's velocity increases constantly due to gravity.
* Initial velocity matters: If the object starts at rest, its velocity after 1.5 seconds will be different than if it had an initial downward or upward velocity.
To calculate the final velocity, you need:
* Initial velocity (v₀): This is the object's velocity at the moment it begins freefall.
* Acceleration due to gravity (g): This is approximately 9.8 m/s².
* Time (t): This is the duration of freefall (1.5 seconds in your case).
Formula:
Final velocity (v) = Initial velocity (v₀) + (acceleration due to gravity (g) * time (t))
Example:
If the object starts from rest (v₀ = 0 m/s), then its final velocity after 1.5 seconds would be:
v = 0 + (9.8 m/s² * 1.5 s) = 14.7 m/s
