What is the average speed of an Olympic sprinter that runs 100 m in 9.88 s?

The metric unit of electrical power is the watt volt ampere ohm

Ahot-air balloon takes off from the ground traveling vertically with a constant upward acceleration of magnitude g/4. after time interval δt, a crew member releases a ballast sandbag from the basket attached to the balloon. how many seconds does it take the sandbag to reach the ground? (express your answer in terms of δt)

During the past 150 years in the united states, how did energy consumption compare to population growth