Question

How long does it take for the plane to stop
with this acceleration?
Answer in units of s

Answer 1

\[v^2 = u^2 + 2as\]I see only one equation of motion with \(s\).

Answer 2

Anyway, what is the acceleration?

Answer 3

not sure if he means units of "seconds"

Answer 4

africanboy you need to provide velocity and acceleration(values)

Answer 5

The question is incomplete :|

Answer 6

i will agree with that

Answer 7

A plane landing on a small tropical island has
just 64 m of runway on which to stop.
If its initial speed is 66 m/s, what is the
maximum acceleration of the plane during
landing, assuming it to be constant?
Answer in units of m/s


How long does it take for the plane to stop
with this acceleration?
Answer in units of s

Answer 8

Fundamental kinematics equations to solve for time:
\[x=x_0+v_0t+\frac{1}{2}at^2, \space v=at\]

Answer 9

The equation Parth provided is a combination of the above two and can be used to find the acceleration.

Answer 10

i just need help with the second part

Answer 11

do you already know the acceleration?

Answer 12

Then use the first fundamental kinematics equation.

Answer 13

It's a quadratic equation in t, and you can use the quadratic formula to solve.

Answer 14

the acceleration is -34.03125

Answer 15

Actually, I think the second one will work too...

Answer 16

0=1/2(-34.03125)t^2+66t-64

solve for t

Answer 17

yes, the second equation, v=at, works too and is a lot easier.

Answer 18

thanks this is my first time using this website

Answer 19

I got 64/33 s. How about you?

Answer 20

Though, you'll probably want to round that to 2 significant figures to be honest about the uncertainty.

Answer 21

sorry still cant find t

Answer 22

\[\Delta v = a \cdot t\]
Is the simplest way to get it. You have the acceleration, a, and the change in velocity is (0m/s - 66m/s) = -66m/s, so use that info to solve for t.