Answer:
metre per seconds
Explanation:
because velocity = distance ÷ time
If it starts at rest the initial velocity is 0.
For an acceleration, a, and time, t, the velocity is v=at. Since at t=4, v=7, then a=7/4=1.75m/s^2
3 hours, because for every 50 km equals one hour 150 divided into 50 equals 3