Aprojectile is fired straight up from ground level. after t seconds it's height is above the ground is h feet where h=-16t^2+144t. for what time period is the projectile at least 288 ft off the ground?

What produces a record of seismic waves? richter scale seismogram barometer seismograph

Which type of microscope would allow the viewer to see ribosomes inside a cell?

Aperson gives a shopping cart an initial push along a horizontal floor to get it moving, and then lets go. the cart travels forward along the floor, gradually slowing as it moves. consider the horizontal force(s) on the cart while it is moving forward and slowing. which of the following statements is correct? (a) both a forward and a backward force are acting on the cart, but the forward force is larger. (b) only a forward force is acting which diminishes with time. (c) both a forward and a backward force are acting on the cart, but the backward force is larger. (d) only a backward force is acting, no forward force.