A person was standing with his two feet on the ground. If the same person stands

Question

A person was standing with his two feet on the ground. If the same person stands with only one foot on the ground, the pressure he exerts on the ground __________ (A) halves (B) remains the same (C) doubles (D) none A car was initially moving with a velocity of 30 m/s. The brakes are applied, and the car decelerates at a rate of NEGATIVE 6 m/s^2 until it finally stops. What distance does the car travel from the moment the brakes are applied until it finally stops? (A) 5 m (B) 75 m (C) 180 m (D) 300 m

Explanation / Answer

We know that P= F/A

Pnew = F/(A/2) = 2F

Doubles

17.

v2 - u2 = 2as

0-302 = 2 (-6) s

s= 900/12 = 75 m

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