Question

the displacement of a particle moving along a straight line at time t is given by x=1+ 2t +3t^2 the instantaneous acceleration is?

Answer 1

65

Answer 2

the ans = -5 units

Answer 3

Sorry hit 6 by mistake

Answer 4

x is displacement: 3t^2+2t+1
x' is velocity : 6t + 2
x'' is acceleration: 6 a constant. I guess I am doing this wrong.

Answer 5

we need instantaneous acceleration

Answer 6

the ans = -5 units

Answer 7

It appears that acceleration is a constant 6, so the instaneous acceleration would be 6. Where am I going wrong here, the approved answer is -5........how is that possible.

Answer 8

I am giving up on this one shameer1

Answer 9

sorry the ans=6 units

Answer 10

sorry for typing mistake

Answer 11

So 6 it is. great.

Answer 12

plzz help new http://openstudy.com/study#/updates/4faf233ce4b059b524fa3a64