Question

A model rocket accelerates upwards at 50m/s^2. Determine the velocity of the model rocket when its fuel is exhausted, 1 second after ignition. You may assume that the rockets initial velocity on the launch pad is zero.

Answer 1

• Acceleration=a=50m/s^2
• Initial velocity=u=0m/s
• Time=t=1s
• Final velocity=v=?

Apply first equation of kinematics

`\\ \tt\hookrightarrow v=u+at`

`\\ \tt\hookrightarrow v=0+50(1)`

`\\ \tt\hookrightarrow v=50+0`

`\\ \tt\hookrightarrow v=50m/s`

Answer 2

The velocity of model rocket 1 second after ignition is 50 m/s.

Step-by-step explanation:

time taken(t) = 1 second

initial velocity (u) = 0 m/s

acceleration (a) = 50 m/s²

final velocity (v) = ?

Now,

a = (v-u)/t

or, 50 = (v-0)/1

or, 50 = v

so, v = 50 m/s