I. Jet-propelled aircraft
II. Rocket propulsion
III. The recoil of a gun
IV. A person walking

A. I and II only
B. I, II, III, and IV only
C. I and III only
D. I, II and III only

Correct Answer:

Option B – I, II, III, and IV only

SEE ALSO  A boy receives the echo of his clap reflected by a nearby hill 0.8s later. If the speed of sound in air is 3.40m/s; how far is he from the hill?

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