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3 years ago

7 km is equal to: 0.7 m 70 m 700 m 7,000 m

Physics

2 answers:

dusya [7]3 years ago

7 0

The answer is 7000 meters.

shepuryov [24]3 years ago

3 0

Salutations!

You need to keep the following in mind:

→ $1km = 1000m$

so >>> $7*1000=7000m$

Hope I helped (:

Have a great day!

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In this exercise we see a case of an entirely inellastic collision between the semi truck and the car, which can be described by the following equation derived from Principle of Linear Momentum Conservation: (We assume that velocity oriented northwards is positive)

$m_{S}\cdot v_{S}+m_{C}\cdot v_{C} = (m_{S}+m_{C})\cdot v$ (1)

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$m_{S}$ , $m_{C}$ - Masses of the semi truck and the car, measured in kilograms.

$v_{S}$ , $v_{C}$ - Initial velocities of the semi truck and the car, measured in meters per second.

$v$ - Final speed of the system after collision, measured in meters per second.

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$v_{S} = -15\,\frac{m}{s}+\left(\frac{2000\,kg}{2200\,kg} \right) \cdot \left(-15\,\frac{m}{s}-45\,\frac{m}{s} \right)$

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