Motion question

[mihir94]

Hi can someone help me with this please?

A model rocket is fired vertically into the air. At a height of +1000m above ground level the engine runs out of fuel as the rocket is travelling at a speed of +85m/s.

What is the maximun height, above ground level, reached by the rocket.

[b^3]

Hi can someone help me with this please?

A model rocket is fired vertically into the air. At a height of +1000m above ground level the engine runs out of fuel as the rocket is travelling at a speed of +85m/s.

What is the maximun height, above ground level, reached by the rocket.

Firstly you know that it gets to 1000 m above the ground, and at this stage it is travelling at 85 m/s upwards. So lets take that as t=0, and taking up as positive.

u=85 m/s
v=0 m/s (as this is where the maximum height will be reached)
(a)=g=-9.8m/s²
x=?



Now that is 368.62 m above that 1000 m, so it will reach the maximum height at 1000+368.62=1368.62 m above ground level.

[mihir94]

Thank you