As shown in the figure below, two blocks ( m 1 and m 2 ) are each released from

Question

As shown in the figure below, two blocks (m1 and m2) are each released from rest at a height of

on a frictionless track and when they meet on the horizontal section of the track they undergo an elastic collision. If

and

determine the maximum heights to which they rise after the collision. Use the coordinate system shown in the figure.

y1f =   m y2f =   m. As shown in the figure below, two blocks (m1 and m2) are each released from rest at a height of h = 4.48 m on a frictionless track and when they meet on the horizontal section of the track they undergo an elastic collision. If m1 = 2.50 kg and m2 = 3.95 kg, determine the maximum heights to which they rise after the collision. Use the coordinate system shown in the figure.

Explanation / Answer

m1 = 2.5 kg

m2 = 3.95 kg

h = 4.48 m
let u1 and u2 are the velocity of the blocks when they collide

v = sqrt(2*g*h) = sqrt(2*9.8*4.48) = 9.37 m/s

so,

u1 = +9.37 m/s
u2 = -9.37 m/s

let v1 and v2 are the final velocities

v1 = (m1-m2)*u1/(m1+m2) + 2*m2*u2/(m1+m2)

= -13.6 m/s


v2 = (m2-m1)*u2/(m1+m2) + 2*m1*u1/(m1+m2)

= 5.157 m/s


Y1f = v1^2/(2*g) = 9.44 m

Y2f = v2^2/(2*g) = 1.357 m

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