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Verified answer
D/ dt= d(30t²-10t+a)/dt
= 60t -10
Vawal => t=0
V(0) =60(0) -10 m/s= -10m/s
B9
v(2) = 120-10 = 110 m/s
a= Vt - Vo / t -0
= 290-110 / 5-2
= 180/3 = 60 m/s²
v(5) = 60(5) -10 = 300- 10 = 290 m/s