You are driving your car along a country road at a speed of 27.0 m/s. as you come over the crest of a hill, you notice a farm tractor 25.0 m ahead of you on the road, moving in the same direction as you at a speed of 10.0 m/s. you immediately slam on your brakes and slow down with a constant acceleration of magnitude 7.00 m/s2 . a. will you hit the tractor before you stop? b. how far will you travel before you stop or collide with the tractor? c. if you stop, how far is the tractor in front of you when you finally stop?

speed of the car = 27 m/s

speed of truck ahead = 10 m/s

relative speed of car with respect to truck

relative deceleration of car

now the distance before they stop with respect to each other is given by

so it will come at the same speed of truck after 20.6 m distance and hence it will not hit the truck as the distance of the truck is 25 m from car

Part b)

Distance traveled by car before it stops is given by

so it will stop after it will cover total 52.1 m distance

Part c)

time taken by the car to stop

now the distance covered by truck in same time

now after the car will stop its distance from the truck is

so the distance between them is 11.5 m

work: w = fd (given)

work done by chet   =50*1 = 50 j

work done by mika =40*2 = 80 j

work done by sara =30*1.5 = 45 j

work done by bill =60*0.5 = 30 j

students in order from the greatest amount of work done to the least is mika> chet> sara> bill

hence option (b) is correct.

b.

explanation: