As a certain object falls, its position s (in meters) above ground after t seconds is given by s(t)=20-5t^2. whats the average velocity of the object on the interval from t=1 to the time .5 seconds later? ? from t=1 to the time .1 seconds later?

Which instrument is used to measure air temperature

Me pl give an example of a collision in real life. use the law of conservation of energy to describe the transfer of momentum. be sure and discuss the momentum before and after the collision occurs. you will need at least 3 sentences to thoroughly answer this question.

Ahot-air balloon is 11.0 m above the ground and rising at a speed of 7.00 m/s. a ball is thrown horizontally from the balloon basket at a speed of 9.00 m/s. ignore friction and air resistance and find the speed of the ball when it strikes the ground.