The velocity$-$time graph of a body has a negative slope. The body is undergoing

$A$ driver of a train travelling at $40 \, m s^{-1}$ applies the brakes as the train enters a station. The train slows down at a rate of $2 \, m s^{-2}$. The platform is $400 \, m$ long. Will the train stop in time?

State whether the following statement is true or false:
Acceleration is defined as the rate of change of velocity.

Why is the motion of an athlete moving along a circular path considered an accelerated motion?

An aeroplane lands at $216 \ km \ h^{-1}$ and stops after covering a runway of $2 \ km$. Calculate the acceleration and the time in which it comes to rest.

Under what condition will the magnitude of the displacement be equal to the distance travelled by an object?