Question

A car a moving at rate of 72 km/h and applies brakes which provide a retardation
How much distance does the car cover before coming to rest
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Answer 1

Answer:

To answer this question use the formula:

v=u+at

s={(u+v)/2}t

v2=u2+2as

s=ut+1/2at2 where s-displacement, v-final velocity, u-initial velocity, a-acceleration/retardation, t-time

i)How much time does the car take to stop?

in this case V=72km/hr (convert to m/s=20m/s), u=0m/s, a=m/s2

since v=u+at..at=v-u..t=(v-u)/a

therefore t=(20-0)/5...=20/5 =4s

therefore it takes 4 seconds to stop

ii)distance covered before stopping: displacement (s)

s= [(u+v)/2]t...=0+20/2 x 4....= 10 x 4= 40ms

hence distance covered is 40 meters

iii)what is stopping distance if speed is doubled?

that means v= 40m/s

hence displacement s,

s= [(u+v)/2]t....= 40/2 x 4

displacement therefore at double speed = 80 meters

Answer 2

Answer:

Let the selling price of each cassette be x,

Let the selling price of each cassette be x,Total sale =125x

Let the selling price of each cassette be x,Total sale =125xprofit =5x

Let the selling price of each cassette be x,Total sale =125xprofit =5xCost = Sales - Profit

Let the selling price of each cassette be x,Total sale =125xprofit =5xCost = Sales - Profit=125x−5x=120x

Let the selling price of each cassette be x,Total sale =125xprofit =5xCost = Sales - Profit=125x−5x=120xprofit % =

Let the selling price of each cassette be x,Total sale =125xprofit =5xCost = Sales - Profit=125x−5x=120xprofit % = 120x

Let the selling price of each cassette be x,Total sale =125xprofit =5xCost = Sales - Profit=125x−5x=120xprofit % = 120x5x

Let the selling price of each cassette be x,Total sale =125xprofit =5xCost = Sales - Profit=125x−5x=120xprofit % = 120x5x

Let the selling price of each cassette be x,Total sale =125xprofit =5xCost = Sales - Profit=125x−5x=120xprofit % = 120x5x ×100

Let the selling price of each cassette be x,Total sale =125xprofit =5xCost = Sales - Profit=125x−5x=120xprofit % = 120x5x ×100=4.16 %

Let the selling price of each cassette be x,Total sale =125xprofit =5xCost = Sales - Profit=125x−5x=120xprofit % = 120x5x ×100=4.16 %The gain percent is 4.16 %

Explanation:

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