11. A test rocket is launched vertically from ground level (y = 0 m), at time t

Physics
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A rocket is launchedvertically from ground level(y = 0 m),at time t = 0.0 s.The rocket engineProvides constant upward acceleration during the burnPhase.At the instant of engine burnout,the rocket has risen to 49m & acquired a velocity of 30 m/sHow long did the burn phaseLast?


May 18th, 2015

s=49m g=10m/s^2

v=30m/s

s=ut+0.5gt^2

v=u+gt

30=0+10t

t=30/10

t=3seconds


May 18th, 2015

2.6 s

2.3 s

2.9 s

3.3 s

3.6 s

:/ u never give me the exact answer 

May 18th, 2015

v^2=u^2+2as

30^2=2*49a

a=900/98

a=9.184

v=u+at

30=0+9.184t

30/9.184=t

t=3.266

t=3.3


May 18th, 2015

are you ok with that

May 18th, 2015

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