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(a)A tram moved downward 21meters in 7 seconds at a constant rate. What was the change in the tram's elevation each second?

(b)In a lab, a substance was heated by 4 Celisse each hour for 40hours. What was the total change in temperature?

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(a) The change in the tram's elevation (speed) each second is 3 meters/Sec

(b) The total change in temperature of the substance was 160 Celsius.

(a) The tram moves downward 21 meters in 7 second. So, the speed of the tram is 21/7 = 3 meters/Sec, which is the tram’s elevation each second.

We know that, speed = (total distance travel)/(Total travelling time)

(b) The substance was heated by 4 Celsius each hour for 40hours.

Therefore, the total change in temperature is = (4x40) = 160 celcius.

The degree Celsius is the unit of temperature on the Celsius scale, originally known as centigrade scale

Learn more about speed here:

https://brainly.com/question/28224010

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