Una pelota se lanza desde el suelo hacia arriba. En un segundo llega hasta una altura de 25 m. a) ¿Cuál será la altura máxima alcanzada?

b) ¿Con qué velocidad se lanzó?

The man of mass m1 and the woman of mass m2 are standing on opposite ends of the platform of mass m0 which moves with negligible friction and is initially at rest with s = 0. the man and woman begin to approach each other. derive an expression for the displacement s of the platform when the two meet in terms of the displacement x1 of the man relative to the platform.

Explain what it means to view something from a frame of reference. provide an example that illustrates your explanation. (4 points)

At 20∘c, the hole in an aluminum ring is 2.800 cm in diameter. you need to slip this ring over a steel shaft that has a room-temperature diameter of 2.804 cm . 1. to what common temperature should the ring and the shaft be heated so that the ring will just fit onto the shaft? coefficients of linear thermal expansion of steel and aluminum are 12×10−6 k−1 and23×10−6 k−1 respectively.