The position-time equation for a certain train is xf = 2.6m + (8.9m/s)7 + (2.5m/s^2)t^2 What is the initial velocity of this train and the acceleration?

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.)

What is the speed of an object at a given moment?

Energy flows from the producer level to the level. is called