2. An object is dropped from rest. Calculate its velocity after 2.5s if it is dropped:
a. On Earth, where the acceleration due to gravity is 9.8m/s?.
b. On Mars, where the acceleration due to gravity is 3.8m/s?

An object weighs 40n in air, weighs 20n when submerged in water and 30n when submerged in a liquid of unknown density. what is the density of the liquid?

If the new moon happens on january 15th, what shape will it be on february 6th?

One hazard of space travel is debris left by previous missions. there are several thousand masses large enough to detect by radar orbiting the earth, but there are far greater numbers of very small masses such as flakes of paint. calculate the force exerted by a 0.110 mg chip of paint that strikes a space shuttle window at a relative speed of 5.00 ✕ 103 m/s and sticks, given the collision lasts 6.00 ✕ 10-8 s. such a collision chipped the window of the ill-fated challenger in june 1983, causing $50,000 of damage.