Answer:
The velocity after 4 seconds will be 20 (m/s)
Explanation:
[tex]a = \frac{dv}{dt} \\\\a*\int\limits^t_ {t0} \, dt = \int\limits^v_ {v0} \, dv \\\\a*(t-to)=v-v0\\v=vo+a*t\\\\replace\\\\\\V0= 0 "acce from rest"\\\\a=5 m/s^2\\v=0+5*(4)\\v=20m/s[/tex]
