Question

x9. A lemming runs from a point A to a cliff at 4 m/s, jumps over the
edge at B and falls to Cat an average speed of 25 m/s. If the total
distance from A to C is 500 m and the time taken for the journey is
41 seconds, find the height BC of the cliff.
Answer is 8km
​

Answer 1

Answer:

400m

Step-by-step explanation:

A->cliff->B->C

4x+25y=500

(x+y)=41, where x is time spent by lemming to travel distance from A to cliff and y is time for the rest of journey;

x=41-y and 164-4y+25y=500, 21y=336, y=16

the height of BC of the cliff is 25y or 25*16=400 m.

answer: 400 m.

Regards,

Timber

United Kingdom