Two children are standing on a 150-kg wagon that is at rest. The children jump off in opposite directions. The 40.-kg boy jumps off at +4.0 m/s and the 50.-kg girl jumps off at -2.0 m/s. What is the speed and direction of the wagon?

Which is not one of the major climate zones? question 3 options: rain forest polar tropical temperate

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 2 options: the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the cold balloon expands and rises. the warm balloon shrinks and sinks. the warm balloon expands and rises. the cold balloon shrinks and sinks.

Diego kicks a soccer ball from the end line. his fellow students time and mark the soccer ball as it moves down the field. the graph represents the ball's progress. based on the graph, during what time is the velocity constant and positive?