A train starting from rest attained a velocity of 20m/s² in 4s. it continued with velocity attained for the next 16s and was finally brought to rest in another 5s. sketch the velocity time graph of the motion. use your graph to evaluate 1: acceleration of the train
2: total distance travelled
3: average speed of the train​

Note: the following questions are unrelated to the balmer series or the martian. refer to your course notes. a sun-sized star will spend most of its lifetime as a: white dwarf b. red giant c. protostar d. main-sequence star

Asmall metal bar, whose initial temperature was 10° c, is dropped into a large container of boiling water. how long will it take the bar to reach 70° c if it is known that its temperature increases 2° during the first second? (the boiling temperature for water is 100° c. round your answer to one decimal place.) sec how long will it take the bar to reach 98° c? (round your answer to one decimal place.)

An object moves from the position +34m to the position -15m in 15 seconds. what is it's total displacement? what is it's average velocity?