(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
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