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aleksandr82 [10.1K]
2 years ago
10

A train traveled 100 kilometers north in 2 hours. After exchanging some railroad cars, it traveled 100 kilometers south in 2 hou

rs along the same track. Why has the train's velocity changed
Physics
1 answer:
hodyreva [135]2 years ago
7 0

Answer:Due to change in direction

Explanation:

Given

Initially train has traveled a 100 km in North and after exchanging some railroad cars, it traveled 100 in south.

The velocity of the train changes as it direction of motion changes. Velocity is the vector quantity which require direction and magnitude for its reperesentation.

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3 0
3 years ago
A child on a skateboard experiences a 75 N force with an acceleration of 1.5 m/s2.
cupoosta [38]

Answer:

The mass of the child + skateboard is 50 kg

Explanation:

In this problem, we can apply Newton's second law:

F = ma

where

F is the net force on a system

m is the mass of the system

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In this problem, our system is the child + the skateboard. The net force on them is

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and their acceleration is

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So we can re-arrange the equation above to find their combined mass:

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3 years ago
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3 0
2 years ago
What effect would decreasing the distance between objects have on their gravitational attraction to each other?
Lady_Fox [76]
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5 0
3 years ago
Read 2 more answers
A 55.0-kg skydiver drew falls for a period of time before opening his parachute. what is his kinetic energy when he reaches a ve
Jlenok [28]
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acceleration (a)=9.81 m/s^2, this is the acceleration due to gravity.

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final velocity=16m/s This is the velocity (speed) the skydiver reaches

The equation we use is KE=.5mv^2
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KE=.5(55kg)(16m/s)^2
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Kinetic energy is 7040 Joules (J)

Hope this helps
3 0
3 years ago
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