Question

Answer all parts please.

A car is initially at rest on a straight road. The qraph shows the acceleration of the car along that road as a fun 2 0 12 3 45 6 7 8 9 10 11 12 13 14 t (s) What is the speed of the car at t-7 s? Submit Answer You have entered that answer before Incorrect. Tries 3/12 Previous Tries What distance does the car cover in the first 8 seconds? Submit Answer Incorrect. Tries 1/12 Previous Tries what is the speed of the car at t=13 s? Submit Answer Tries 0/12 Determine the distance covered by the car between t-11 s and t-14 s'? Submit Answer Incorrect. Tries 1/12 Previous Tries

Answer 1

Area under acceleration time graph is equals to speed.

So here we have to take area from t=0 to t=7 sec

So v= 2×(2-1)+3×(3-2)+2×(4-3) -2×(7-5)

Or v= 3m/s

Hence v at t= 7 sec is 3m/s

For next part see image