The dummy in a crash test has a head of mass 3 kg. the, Ask an Expert

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Q1. The dummy in a crash test has a head of mass 3 kg. The dummy is strapped in firmly so that the body does not move. The car's forward speed changes from 24 m/s to zero in 0.23 s.

Why do you think the passenger seats in armed force's aeroplanes face rear of the plane?

Q2. A spelunker is surveying a cave. She follows a passage 160 straight west, then 280 in a direction 48 east of south, and then 280 at 40 east of north. After the fourth unmeasured displacement, she finds herself back where she started.

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