Question

23) Suppose we represent the distance above the ground as positive integer and the below the
the below the ground as negative integer. If the lift descends from third 7th floor the rate of 5m per 4 sec then where will be the lift after 20 sec . distance between two consecutive no is 5 m what is the Distance between basement 1 and 5 th floor and how much time will then take to cover that distance​

Answer 1

Step-by-step explanation:

speed of the lift is 5/4 m/sec.

time to cover 5 m. at that speed is 4 seconds.

so,after 20 seconds,the lift covers 25 m.

so,the lift will be in 2 nd floor.

distance between 1&5 floors is 20 m.

time to cover that distance is 16 seconds.