Edexcel AS Mechanics 1 revise doubt
Hi, I worked out a question in the revision guide of edexcel AS mechanics and I got the answer 50 but in the answers it says that it is 42 not 50. I have no idea how that answer could be worked out. Please help me. This is the question:
A car is travelling along a straight motorway at a constant speed V m/s. Ten seconds after passing a speed-limit sign, the driver brakes and the car decelerates uniformly for 5 seconds, reducing its speed to 30m/s. Given that the car covers a distance of 600m in the 15 second period, find the value of V.
Anyone, suggestions please?
A car is travelling along a straight motorway at a constant speed V m/s. Ten seconds after passing a speed-limit sign, the driver brakes and the car decelerates uniformly for 5 seconds, reducing its speed to 30m/s. Given that the car covers a distance of 600m in the 15 second period, find the value of V.
Anyone, suggestions please?
Show me your working out
It helps to sketch a velocity-time graph where the area under the graph is the displacement covered.
It helps to sketch a velocity-time graph where the area under the graph is the displacement covered.
(edited 7 years ago)
Original post by ManLike007
Show me your working out
It helps to sketch a velocity-time graph where the area under the graph is the displacement covered.
It helps to sketch a velocity-time graph where the area under the graph is the displacement covered.
I drew a velocity-time graph and calculated the area.
600=1/2 * (V-30) * 15 + 30*15
Original post by Rashina
I drew a velocity-time graph and calculated the area.
600=1/2 * (V-30) * 15 + 30*15
600=1/2 * (V-30) * 15 + 30*15
Your calculation of the area of a trapezium looks wrong
Posted from TSR Mobile
Original post by gdunne42
Thank you.Now I got it correct. I got the answer.
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