Question

7.How long (în seconds) does it take for a rocket sledaccelerating at 15.0 m/s2 to change its speed from20.0 m/s to 65.0 m/s?

Answer 1

The time taken by the rocket sled is 3 s.

Given data:

The acceleration of the rocket sled is a=15.0 m/s².

The initial velocity is u=10.0 m/s.

The final velocity is v=65.0 m/s.

The expression for the acceleration is given by,

$a=\frac{v-u}{t}$

Here, t is the time taken.

Substitute the given values in above equation to calculate the time,

$\begin{gathered} 15=\frac{65-20}{t} \\ t=3\text{ s} \end{gathered}$

Thus, it will take 3 s to attain the required acceleration.