Question

Find the total distance covered by a car when it decreases its velocity at a constanta
A) 1.1 km
B) 1001 km
C) 1000 km
D) 1100 km
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Answer 1

Answer:

the velocity of the car is decreased constantly at the time: t=0s to t=10s

t=15s to t=20s

distance = Area of graph under the slope

1st distance

S1 =1/2 x base x height

S1=1/2 x 10 x 150

S1=750m

S1=0.75km

2nd distance

S2=length x breadth + 1/2 x base x height

S2=50 x 5 + 1/2 x 5 x 50

S2=250 + 125

S2=375m

S2=0.375km

total distance covered by the car when it decreases it's velocity at a constant

=S1+S2

=0.750 +0.375

=1.125 km ≈ 1.1 km