Q1. The velocity-time graph of a body is given below:
. .
Velocity ( In Km/h)
8 8 8 8
P
Em our
Study the
graph and answer the following questions:
(1) What is the initial velocity of the body?
(s!) What is its final velocity after 2 hours?
Ini) During which time period does it undergoes retardation?
(iv) What is its average velocity during AB?
(v) How much distance does it cover during AB?
Answers
Answer:
a. Area of graph above time axis
A=21×(8−4)×10=60m
Area of graph below time axis
B=21×4×10=20m
Average velocity in whole time of motion
v=TotaltimeDisplacement = TotaltimeAreaA−AreaB
= 1260−20=3.33ms−1
b. Average speed in whole time of motion
vav=TotaltimeTotaldistance=TotaltimeAreaA+AreaB=1260+20=6.67ms−1
c. Acceleration:
From 0 to 2 s;
a=t2−t1v2−v1=2−010−0
Answer:
1 ,2 2
Explanation:
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