A spacecraft of mass 20000 kg is travelling at 1500 m per second. It's rocket ejects hot gas at a speed of 1200 m per second relative to the spacecraft. during one burn the rockets are fired for a period of five seconds. in this time the speed of the spacecraft's increases by 3 m per second. what is the acceleration of the spacecraft? assuming that the mass of the fuel injected is negligible compared with the mass of spacecraft determine the distance traveled during the burn. what is the thrust produced by The Rockets? determine the mass of the gas ejected by the rocket during the burn.

hotter stars = bluer stars

answer: point c: b. 1/2 potential, 1/2 kinetic, point a: 3/4 of its potential energy, point d or b: 3/4 potential, 1/4 kinetic

explanation: i cant explain. it's difficult to explain.

the answer is false

explanation:

answer: at 24 february, 2014 the population gets twice of its initial population.

explanation:

since we have given that

the population for alpha city, t years after january 1, 2004 is given as

first we find out the initial population, i.e. t=0,

so, our quadratic equation becomes,

according to question, we have said that if the population has twice its initial population, then it becomes

so, time taken to reach this above mentioned population is given by

now, we know that time can't be negative so, we take t=9.149 years.

hence, at 24 february, 2014 the population gets twice of its initial population.