# physics

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What is the horizontal velocity of the pencil? the ? is you are standing in the aisle of a bus that travels along a straight road at 100km/h, and you hold a pencil still above your head. then relative to the bus,the velocity of the pencil is km/h and relative to the road,the pencil has a horizontal velocity of one the following. which is it. less than 100km/h 100km/h or more than 100km/h ? please explain

• physics -

relative to the bus, it is not moving.
Relative to the ground, it is the same as the bus.

VeloPencilrelativetoground=Vbusrelative to ground + Vpencilrelativeto bus

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