Sagot :
Answer:
Step-by-step explanation:
Multiply the height by 2, and divide the result by the object's acceleration due to gravity. Multiply the time by the acceleration due to gravity to find the velocity when the object hits the ground. If it takes 9.9 seconds for the object to hit the ground, its velocity is (1.01 s)*(9.8 m/s^2), or 9.9 m/s.