Aship sails a distance of 600 km at a speed 20 km/h: for what amount of time was the ship sailing? is this a scalar or vector quantity?

If forces acting on an object are unbalanced. true or false

Aplayer uses a hockey stick to push a puck at a constant velocity across the ice. the weight of the puck is 170 n. the coefficient of friction is 0.0600. with what force must the player push the puck so that his force just equals the frictional force? 28.3 n 0.999 n 0.102 n 0.0104 n

When doing scientific research ,the sources used should be ?