A car is accelerated on a levelled road attains a velocity 4 times of its initial velocity. In this process the potential energy of the car

This is for my 8th grade science class, i really don’t understand. can someone me? , lol.

Acar is traveling 35 mph on a smooth surface . if a balanced force is applied to the car what happens?

Determine the largest intensity w of the uniform loading that can be applied to the frame without causing either the average normal stress or the average shear stress at section b–b to exceed σ=19 mpa and τ=24 mpa, respectively.