y=(1/2)t^2 + (1/2)t her (0 less or =t less or =60)?

Question

(a). height of ballon at the end of 39 sec?
(b).Average velocity between t=0 and t=39?
(c).velocity of ballon at end of 39 sec?

Answer 1

a)
y=(1/2)t^2 + (1/2)t let me give you a hint

y(t)=(1/2)t^2 + (1/2)t

b)Let me give you a hing again
V(avg)=(y2-y1)/(t2-t1)

c)
I would say
y'(t)=t+1/2