The speed of an object, one second after it has been dropped on the planet, is 8 m/s. What will be it's speed after its speed after 3 seconds when it was first dropped?

24 m/s

32 m/s

38 m/s

None of these

Explanation

Given the object's speed is 8 m/s after 1 second, we can determine the acceleration due to gravity on this planet is 8 m/s², since it starts from rest (0 m/s).

To find the speed after 3 seconds, we use the formula: speed = initial speed + acceleration × time

Initial speed = 0 m/s (since it's dropped)

Acceleration = 8 m/s²

Time = 3 seconds

Speed after 3 seconds = 0 + 8 × 3 = 24 m/s