Calculating Time in Air for a Vertically Launched Rocket

AI Thread Summary
To calculate the time a toy rocket stays in the air after being launched vertically at an initial velocity of 29.2 m/s, the formula t = (v - u) / a is applied, where v is the final velocity (0 m/s at the apex), u is the initial velocity (29.2 m/s), and a is the acceleration due to gravity (approximately -9.81 m/s²). The user correctly notes that the total time in the air is double the time taken to reach the apex. This method is valid for determining the total flight duration. The discussion confirms the approach and acknowledges the multiplication by two for total time.
kingyof2thejring
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Question 3
A toy rocket is fired vertically upwards with an initial velocity of 29.2 ms-1. Calculate how long (in s) the rocket stays in the air before it returns to the ground.
s=?
u=29.2
v=0
a=-g
t=?
i've used t=(v-u)/a and then multiplied the answer by 2
is this the correct method to calculate the answer.
thanks in advance
 
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Looks good to me.
 
v is 0 at the apex.

Edit: Sorry, I see you multiplied by 2.
 
Last edited:
cheers!
 
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