lilbaker_
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Hi can someone help me with this kinematics questions I'm struggling with from Isaac Physics?
A lorry travelling along a narrow road with speed u1 applies its brakes to give a uniform deceleration of magnitude a1. At the same time a car, a distance d behind the lorry and travelling in the same direction with speed u2, applies its brakes to give a uniform deceleration of magnitude a2.

By considering the distance travelled by each vehicle before coming to rest, show that a collision will occur if a2≤ku2^2, and find k in terms of u1, d and a1.

Thanks!
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TSR Jessica
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Sorry you've not had any responses about this. Are you sure you've posted in the right place? Here's a link to our subject forum which should help get you more responses if you post there.
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JackMac2904
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This is my solution. First I found the distance to stop for both the lorry and the car. Then considered that a collision would occur if the stopping distance of the car plus the distance d is greater than the stopping distance of the lorry.

I tried uploading an image of my solution but it isn't working. Using suvat and algebraic manipulation, you should be able to get the answer!
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nooksnd
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(Original post by JackMac2904)
This is my solution. First I found the distance to stop for both the lorry and the car. Then considered that a collision would occur if the stopping distance of the car plus the distance d is greater than the stopping distance of the lorry.

I tried uploading an image of my solution but it isn't working. Using suvat and algebraic manipulation, you should be able to get the answer!
Hi do you know the answer to this?
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JackMac2904
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(Original post by nooksnd)
Hi do you know the answer to this?
Sorry the photo's a little blurry

https://imgur.com/a/Y1xIM31
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nooksnd
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(Original post by JackMac2904)
Sorry the photo's a little blurry

https://imgur.com/a/Y1xIM31
Thank you!
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Rsib02
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this doesn't work?
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