20. Distance above the ground is written as positive integer and dista

1.	20. Distance above the ground is written as positive integer and distance belowis written as negative integer, then answer the following.1. Elevator descends into mine shaft at the rate of 8 mts per minute.Find its position after 40 minutes.2. Lift reaches 15 mts above ground in 3 minutes. Find its speed in mts/min.
Answer» i) distance covered by elevator in the mine is 8*40= 320metres , but its down the ground so -320m ii) speed of the lift is = 15/3 = 5mts/min

20. Distance above the ground is written as positive integer and distance belowis written as negative integer, then answer the following.1. Elevator descends into mine shaft at the rate of 8 mts per minute.Find its position after 40 minutes.2. Lift reaches 15 mts above ground in 3 minutes. Find its speed in mts/min.

Answer»

i) distance covered by elevator in the mine is 8*40= 320metres , but its down the ground so -320m

ii) speed of the lift is = 15/3 = 5mts/min