A bus is moving in astraight line at speed of 25m/s. What time does bus take to cover 5 km

1which body contains the majority of the mass in the solar system earth jupiter the moon the sun 2 what keeps the objects in the solar system such as planets orbiting around the sun the force of gravity the galaxy exerts on all objects within it including the solar system the great distance between the sun and the planets the sun's nuclear fusion which acts on each object the gravitational force between the sun and each object in the solar system

Substances that assume the shape of their container, but do not have a definite size are called

Atoms containing radioactive nuclei are called