Recitation Quiz 2 Solutions

# Recitation Quiz 2 Solutions - Version C A ball is dropped...

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Quiz for Thursday, August 30. Version A: A car has a speed of 50 km / hr. When the driver breaks as hard as he can it takes 4 seconds to come to rest. (a) Assuming that the acceleration is constant, give the acceleration in mlsz. (b) How far does the car move during the stopping process? ^) V =Vo*dt O = *# t t o-[*l o= , \ r I L t +2 Ot,',/ rrr e. .(\ ,\ \r t b) ,, = Vuf + !o\" Pt*"(- rN FoA n )to ) \ A: (a) 4.a7 m/sz (b) 27.8 m Version B. A car can accelerate from zero to 50 km / hr in 3 seconds. (a) Assuming that the acceleration is constant, grve the acceleration in m/s2. (b) How far has the car moved betweent:0andt:3 s? 6"H= ;T-l*U,vnl '/r, U {: \-*t' A: @) a.63 mlsz (b) 20.8 m
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Unformatted text preview: Version C: A ball is dropped straight down from a given height. If it starts at rest and takes 3 seconds to hit the floor, (a) how high was it when it was released and (b) how fast is it moving just before it hits the ground? (Let the gravitational acceleration be 9.8 m/s'.) q \\= l?\' L)k\=\- ?t\ =?t A: (a) a4.l m (b) 29.a mls Version D. A car accelerates in a straight line toward a wall with a constant acceleration of 9.8 m/s2. If it starts at rest and takes 3 seconds to hit the wall, (a) how far does it go before impact and O) how fast is it moving just before it hits the wall? .. I _V2-o-\ \x= *qT-) - * \ - t r k\ v = c \ A: (a) 44.r m (b) Ze.a mls " /...
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