Question

considerd an EV with the following details. Total mass = 1200 kg, front area = 2 m2, aerodynamic drag coefficient = 0.25 and tire rolling friction coefficient = 0.02, air density = 1.25 kg/m3, acceleration due to gravity = 10 m/s2. Equivalent mass for rotational mass can be taken as 6% of total mass. The wheel is connected to a three phase induction motor with a gear. Gear efficiency is 0.9. Induction motor is operating in constant torque region. The vehicle starts from rest and linearly reaches velocity of 80 km/hr in 10 seconds.

1 point

Maximum acceleration of the vehicle is

2.22 m/s2

 

8 m/s2

 

800 m/s2

 

222.2 m/s2​

Answer 1

Answer:

2.22m/s

Explanation:

Answer 2

Answer:2.2 m/s^2

Explanation: v= u + at

                     80*(1000/3600) m/s= 0+ a*10  (u =0, vehicle is at rest at t=0)

                                       22.2222   =  10a

                                                     a  =2.2 m/s^2

we are not considering aerodynamic drag, rolling friction and acceleration due to gravity because at the last line they mentioned that vehicle starts from the start and LINEARLY reaches velocity 80 km/hr in 10 sec