1)as velocidades escalares de dois pontos materiais ,aeb sao constantes. a figura os representa no instante t=0 e as setas indicam o sentido de cada movimento . tambem estao indicados os modulos das suas velocidades escalares
a)escreva a funçao horaria dos espaços de cada um e determine o intante de encontro
b) determine o local de encontro

2)determineo intervalo de tempo para que um trem de 240m com uma velocidade escalar constante de 108km/h atravesse completamente um tunel de comprimento 1980m

Aperson gives a shopping cart an initial push along a horizontal floor to get it moving, and then lets go. the cart travels forward along the floor, gradually slowing as it moves. consider the horizontal force(s) on the cart while it is moving forward and slowing. which of the following statements is correct? (a) both a forward and a backward force are acting on the cart, but the forward force is larger. (b) only a forward force is acting which diminishes with time. (c) both a forward and a backward force are acting on the cart, but the backward force is larger. (d) only a backward force is acting, no forward force.

What is the speed of an object at a given moment?

How is the acceleration of an object in uniform circular motion constant? a - in magnitude only b - in direction only c - in both magnitude and direction d - in magnitude, direction & orientation