Answer:
The car is moving at 24.04 m/s after 210 seconds
Explanation:
We have equation of motion s = ut+0.5at², t is time, u is initial velocity, a is acceleration and s is displacement.
Acceleration, a = ?
Initial velocity, u = 6.4 m/s
displacement, s = 3.2 km = 3200 m
Time, t = 3.5 min = 210 s
Substituting
s = ut+0.5at²
3200 = 6.4 x 210 + 0.5 x a x 210²
a = 0.084 m/s²
We have equation of motion v = u + at, v is the final velocity
v = 6.4 + 0.084 x 210
v = 24.04 m/s
The car is moving at 24.04 m/s after 210 seconds
