A 3.00 gram dart compresses a spring by 4.00cm. The dart lands 3.60m downrange when fired horizontally from the gun from a height of 113cm. All answers must be given in standard S. I. units as a number without units, using precisely 2 significant digits. (e. g. 12.0N = 12 or 0.3s = .30)

what is the air-time of the dart
what is the horizontal velocity of the dart
what is the initial kinetic energy of the dart
what is the spring constant

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.