Question

The automobile is originally at rest at s = 0. If its speed is increased by dv/dt = (0.05t2)ft/s2, where t is in seconds, determine magnitudes of its velocity and acceleration when t = 18 s.

Answer 1

V=dv/dt * t + vi

acceration is constant, a=dv/dt

Answer 2

Notice acceleration is not constant, but you can figure it from dv/dt at the given time.

Answer 3

smd wei