Toy friend !

Classical Mechanics Level 2

A piece of wood of length 250m is incline with the wall at an angle of 30 degree . If a toy car is left from the top of the wood at what velocity will it come down of the wood ? (Assume that the mass of the wheels are less compared with the rest of the car)

Note : Answer in three significant figures .


The answer is 49.5.

Kowshik Dey by kowshik dey , 20, Bangladesh

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2 solutions

Lê Triết
Apr 7, 2014

v=sqrt(g*h)

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potential energy at the top of the system[wood slope here] will supply the kinetic energy of the car. at the lowest point this pot. energy will be completely converted into kinetic energy.[neglecting the frictional forces, rotational energy of the wheels, earth's rotation.... bla bla bla...]the potential energy at he top= mass[of the car]* vertical height of the system * gravitational force = m 250sin30 * 9.81 = (m v^2)/2.........find the value of v which is the velocity at the undermost point

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