Q1. 2 trains are running in opposite directions set out towards each other from stations A and B respectively, train 1 at 60kmph and train 2 at 40 kph, the faster train meets the slower train at a certain point after covering an additional distance of 34 km, find the total distance between stations A and B.
Q2. You travel to an alien planet. The local population tries very hard to tell you what gravity is on the surface. You cannot understand them, and do not have a tool to calculate gravity directly. You also ran out of water. They offer a liquid to you, other than you don't know what it is. Your ill-prepared journey, however, may not be the total loss. Is there a way to measure the density of the liquid if you have a block of balsa-wood (170 kg/m^3) that is 10cm x 10 cm x 10cm and a good ruler? Describe why or why not. Include any relevant numbers.