number 1 please Frank is wearing his seat belt so he\'s safe, but Estelle is not

Question

number 1 please

Frank is wearing his seat belt so he's safe, but Estelle is not wearing hers so Frank has to prevent her from striking the dash board (it's an old car worthy of the Costanzas, so no air bag is going to get in the way of his plan). If the car was going 12.5 m/s and came to a stop in 0.120 s, how much force would Frank have to supply with his arm to stop the 63.0 kg Estelle? Take that force and convert it to a weight in pounds using 4.448 N per pound, and consider whether you think Frank could lift that weight with one arm.

Explanation / Answer

F = dP/dt

dP = change in momentum

dP = 63 ( 0 - 12.5 )

dP = -787.5 Kg . m/s

dt = 0.120 s

F = 6562.5 N

now given 1 N = 4.448 Pound

1 Pound = 1/4.448 * N

6562.5 N = 1475.38 pound

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