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3 years ago

A train travels 120 km In 2 hours and 30 minutes what’s its average speed

Physics

2 answers:

dangina [55]3 years ago

8 0

Formula for distance is d=st
so for speed is s=d/t
48 km per hour

Sedaia [141]3 years ago

5 0

Speed= distance / time or s=d/t.

120 / 2.5 (2.5 is 2 hours and 30 minutes.) = 48 km/h

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So the final image is inverted

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Let f be force of friction on the blocks kept on inclined plane. T be tension in the string

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For motion of hanging block on in downward direction

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Adding to cancel T

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Note: There is no image to take as a reference, so I'm assuming F2 directed to the right and F1 to the left, and F2=2F1

Answer:

$\displaystyle a=\frac{F}{3M}$

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Explanation:

Net Force

When several forces are applied to a particle or a system of particles, the net force is the sum of them all, considering each force as a vector. As for the second Newton's law, the total force equals the product of the mass by the acceleration of the system:

$\vec F_n=m\cdot \vec a$

If the net force is zero, then the system of particles keeps at rest or at a constant velocity.

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$m_2=2m_1=2M$

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$F_2=2F_1=2F$

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The net force of the system of particles is

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Since F2 is greater than F1, the direction of the acceleration is to the right.

Note: If the forces were opposite than assumed, the acceleration would be to the left

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