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VikaD [51]
3 years ago
8

Which situation is a result of human activities?

Physics
1 answer:
ch4aika [34]3 years ago
7 0
B acid rain in an area kills fish in a lake
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A car moves at a speed of 40 miles per hour for half an hour and then at 60 miles per hour for two hours. What is the average sp
katovenus [111]

Answer:

The average speed for the entire trip is 56 miles/hour.

Explanation:

It is given that,

Initially, the car moves with a speed of, v₁ = 40 miles/hour

Initial time, t₁ = 0.5 hours

Distance covered during time t₁,

d_1=v_1t_1

d_1=40\times 0.5

d_1=20\ miles

Then it travels with a speed of, v₂ = 60 miles/hour

Then time taken, t₂ = 2 hours

Distance covered during time t₂,

d_2=v_2t_2

d_2=60\times 2

d_2=120\ miles

The average speed of the car can be calculated as :

v=\dfrac{d_1+d_2}{t_1+t_2}

v=\dfrac{120+20}{0.5+2}

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