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3 years ago

15

Two cars are heading towards each other but are 12 km apart. one car is going 70 km/hr, and the other is going 50 km/hr. how muc

h time do they have before they collide head on?

1 answer:

vova2212 [387]3 years ago

3 0

<span>12-50t=70t, t= 0.1h = 6 minutes.</span>

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Answer:

= 308.5 N

Explanation:

acceleration of rocket for safe landing

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$a = \frac{v_{y}^{2} - v_{0}^{2} }{2y}$

$v_{0}$ = initial velocity

$v_{y}$ =final Velocity

m = mass of rocket

$\frac{0^{2} - 30^{2} }{2\times80}$

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Upward force

F - mg = ma

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F = m(a+g)

m= mass

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Recall that the dot product between two vectors $\mathbf a$ and $\mathbf b$ satisfies

$\mathbf a\cdot\mathbf b=\|\mathbf a\|\|\mathbf b\|\cos\theta$

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So if $\mathbf a=(2,3)$ and $\mathbf b=(4,2)$ , then

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$\implies2\cdot4+3\cdot2=\sqrt{2^2+3^2}\sqrt{4^2+2^2}\cos\theta$

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3 years ago

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Answer:

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The velocity of a wave, v = f × λ

Where;

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λ = The wavelength of the wave - The distance between crests =

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Answer:

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