Una pelota de tenis de 0,06 kg se mueve con una velocidad de 2,5 m/s y choca de frente con una pelota de 0,09 kg que se alejaba de la primera bola con una velocidad
de 1,15 m/s. Si la colisión es elástica, ¿Cuál es la dirección y velocidad de las dos bolas
después del choque?

The uniform slender bar rests on a smooth horizon- tal surface when a force f is applied normal to the bar at point a. point a is observed to have an initial acceleration aa of 20 m/s2, and the bar has a corre- sponding angular acceleration of 18 rad /s2. deter- mine the distance b.

Which of the following is not a means to accelerating? question 4 options: a)increase speed b)remain still c)decrease speed d)change direction

Contrast the force of gravity between these pairs of objects: 1-kg mass and a 2-kg mass that are 1 m apart; a 1-kg mass and a 2-kg mass that are 2 m apart; and two 2=kg masses that are 1 m apart. i dont understand.