I want to calculate the travelled length of a car.
A travelling car with a acceleration from 0 m/s to 19.4 m/s in 10 sec. From there it has a speed of 19.4 m/s for 11 sec. After the 21 sec. the car hit the brakes, and deaccelerates to 0m/s in 3 sec.
The Attempt at a Solution
I find the acceleration in the to periods first
Acceleration = 19.4/10sec = 1.9 m/s^2
Deacceleration = -19.4/3sec. = -6-47 m/s^2
The I want to divide the travelled length for each individual timeperiod.
The first period (10 s) is = 1/2 * 1.9 * 10^2 = 95 meters
Seceond period (11 s) is = 19.4*11 = 213.4 meters
Third period (3 s) = -1/2*-6.47*3 = 9.7 meters
Travelled distance in all = 95+213.4+9.7 = 336.1 meters.
Is this correct?!
And yes I'm new here, so hello to everyone. Hope this can help me be better at phys/maths. I'm starting engineering soon, so I better get this handled!