Answer:
for reasoning you could put -> the line is at the top at the left handed sided of the chart (also the beginning) slopes down towards the very bottom right handed side of the chart, symbolising less force as distance goes.
Answer:
Explanation:
Given
Velocity of bat 
Frequency of sound 
velocity of sound 
using Doppler Effect apparent frequency is given by

where
apparent frequency
v=velocity of sound in the given media
velocity of source
velocity of observer
here velocity of source is zero
as source is travelling towards source thus

Answer:
Lever
Explanation:
Fulcrum point is the point where the lever turns.
It is the center of a key activity