Two rollerbladers face each other and stand at rest on a flat parking lot. tracey has a mass of 32 kg, and jonas has a mass of 45 kg. when they push off against one another, jonas acquires a speed of 0.50 m/s .

Momentum is a product of mass and the velocity of a body. The initial momentum is always equal to the final momentum during collisions between two bodies.
Therefore; M1U1 +M2U2 = M1V1+ M2V2, where m1 is the mass of tracey and m2 is the mass of jonas, while u is the initial velocity and v is the final velocity.
 (32 ×0)+ (45×0) = (32 × v1) + (45 × 0.50)
                       0 = 32V1 + 22.5
                     32 V1 = -22.5
                          V1 = - 0.703 ( negative indicates difference in direction)
There, Tracey's speed will be 0.703 m/s

Earthplanet yplanet y5=earth     *many different equationsplanet x1.5=earthplanet x is two times planet yobject 5,2500 mass5,1,3,2,4object 1 is four times obect 4