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satela [25.4K]
3 years ago
15

You drive 6.0 km at 50 km/h and then another 6.0 km at 90 km/h. Your average speed over the 12 km drive will be ____

Physics
1 answer:
Elis [28]3 years ago
5 0

Answer:

The average speed is less than 70 km/h.

(B) is correct option.

Explanation:

Given that,

distance = 6.0 km

Speed = 50 km/h

Speed = 90 km/h

We need to calculate the time in 6.0 km distance

Using formula of time

t = \dfrac{d}{v}

Put the value in to the formula

t=\dfrac{6.0}{50}

t=0.12\ hr

We need to calculate the time in another distance

Using formula of time

t = \dfrac{d}{v}

Put the value in to the formula

t=\dfrac{6.0}{90}

t=0.067\ hr

We need to calculate the average speed

Using formula of average speed

v=\dfrac{D}{T}

Where, D = total distance

T = total time

Put the value into the formula

v=\dfrac{12}{0.12+0.067}

v=64.17\ km/hr

Hence, The average speed is less than 70 km/h.

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A toy car runs off the edge of a table that is 2.225 m high. If the car lands 0.400 m away from the base of the table, how fast
ruslelena [56]

Answer:

0.594 m/s

Explanation:

First, find the time it takes to land.

Given, in the y direction:

Δy = 2.225 m

v₀ = 0 m/s

a = 9.8 m/s²

Find: t

Δy = v₀ t + ½ at²

(2.225 m) = (0 m/s) t + ½ (9.8 m/s²) t²

t = 0.674 s

Next, find the horizontal velocity.

Given, in the x direction:

Δx = 0.400 m

a = 0 m/s²

t = 0.674 s

Find: v₀

Δx = v₀ t + ½ at²

(0.400 m) = v₀ (0.674 s) + ½ (0 m/s²) (0.674 s)²

v₀ = 0.594 m/s

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And the correct answer is A) on the surface of the moon; because Newton's second law provides the explanation for the behavior of objects upon which the forces do not balance. The law states that unbalanced forces cause objects to accelerate with an acceleration that is directly proportional to the net force and inversely proportional to the mass.

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