The firecracker struck the packed dirt with a dull thump , not a detonation. A puff of dust. For a moment, nothing.
He exhaled, checked his watch, and thought: From rest to rest. Just a 46‑meter scream in between. A Pyrotechnician Releases A 3-kg Firecracker From Rest
From rest. Zero velocity. All its future velocity borrowed from gravity alone. The firecracker struck the packed dirt with a