A plane has a mass of M = 281 tons takes-off at a speed of Vf = 273 km/hr. If it starts form rest, what should be the minimum acceleration to take off if the length of
the runway is L = 2.2 km

Ineed extreme for task 2. my student number is 571721. many to whoever solves this correctly, im in debt to you.

Copper has free electrons per cubic meter. a 71.0-cm length of 12-gauge copper wire that is 2.05 mm in diameter carries 4.85 a of current. (a) how much time does it take for an electron to travel the length of the wire? (b) repeat part (a) for 6-gauge copper wire (diameter 4.12 mm) of the same length that carries the same current. (c) generally speaking, how does changing the diameter of a wire that carries a given amount of current affect the drift velocity of the electrons in the wire?

What is the acceleration of a spaceship that is initially at rest and then speeds up to 220 m/s in 20 seconds