A person is sitting on a bus that stops suddenly, causing her head to tilt forwa

Question

A person is sitting on a bus that stops suddenly, causing her head to tilt forward.

Part A
The bus will decelerate rapidly and her head continue forward at the same speed, so that it advances with respect to the bus. After the bus has stopped with respect to the ground, her head will appear to accelerate backward toward the rear of the bus to rejoin its headrest. Choose the point of view which the explanation of the acceleration of the head given above corresponds to.

The bus will decelerate rapidly and her head continue forward at the same speed, so that it advances with respect to the bus. After the bus has stopped with respect to the ground, her head will appear to accelerate backward toward the rear of the bus to rejoin its headrest. Choose the point of view which the explanation of the acceleration of the head given above corresponds to.

the point of view of another person on the bus
the point of view of another person on the other bus that moves in the same direction
the point of view of an observer on the ground
the point of view of another person on the other bus that moves in the opposite direction

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Part B
Her head will accelerate forward as if pushed by a mysterious force as the bus stops and then accelerate backward to rejoin her headrest just after the bus has stopped. Choose the point of view which the explanation of the acceleration of the head given above corresponds to.

Her head will accelerate forward as if pushed by a mysterious force as the bus stops and then accelerate backward to rejoin her headrest just after the bus has stopped. Choose the point of view which the explanation of the acceleration of the head given above corresponds to.

the point of view of another person on the other bus that moves in the opposite direction
the point of view of another person on the bus
the point of view of another person on the other bus that moves in the same direction
the point of view of an observer on the ground

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Part C
Which observer is in an inertial reference frame?

the person on the bus
the person on the other bus that moves in the same direction
the person on the other bus that moves in the opposite direction
the observer on the ground

Explanation / Answer

For remaining at same position,velocity with respect to ground should be zero, as person is moving with 8 m/s ( let in positive x direction) so velocity of trademill should be 8 m/s( in negative x direction i.e in direction opposite to which person is moving in trademill)or we can say -8m/s.

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