A rocket ship is moving through space at 2000 m/s. It accelerates in the same direction at 6 m/s2. What is its speed after 100 seconds?

Ahot-air balloon is drifting straight downward with a constant speed of 2.40 m/s. when the balloon is 7.63 m above the ground, the balloonist decides to drop one of the ballast sandbags to the ground below. how much time elapses before the sandbag hits the ground?

Heena wants to measure the volume of a ball that is 24 cm across. how should she set up her equation?

What are similarities and differences of reflection, refraction, diffraction and absorption?