Question

A 20 N model rocket launched vertically is clocked at 25 m/s when it is 15 m above the ground (and has expended a negligible amount of fuel). Use the work–energy principle to find the rocket’s initial speed.
27.4 m/s
40.2 m/s
17.8 m/s
30.3 m/s

Answer 1

30.3 m/s is the correct answer.