Atest rocket is launched vertically from ground level (y = 0 m), at time t = 0.0 s. the rocket engine provides constant upward acceleration during the burn phase. at the instant of engine burnout, the rocket has risen to 49 m and acquired a velocity of 30 m/s how long did the burn phase last? a: 2.6 s b: 2.3 s c: 3.3 s d: 3.6 s e: 2.9 s

The rocket starts at rest, so its initial velocity is 0. If the burn phase lasts seconds, then during this interval the rocket's velocity is

and its position is

So we have

and the answer is C.

radial fractures in a piece of glass look most like which of the following?

a. spokes of a wheel

b. a circle

c. a zig zag

d. none of the above

the correct answer is a. spokes of a wheel

hope this (: