Answer

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**Hint:**The rate at which an object's position changes in relation to a frame of reference is called velocity, and it is a function of time. The term "velocity" refers to a description of an object's speed and direction of motion.

**Complete step-by-step solution:**

Speed is the rate at which an object moves along a path in terms of time, while velocity is the rate and direction of movement. In other words, while speed is a scalar value, velocity is a vector. Average velocity is determined by dividing the change in position \[\left( {\Delta r} \right)\] by the change in time \[\left( {\Delta t} \right)\] in its simplest form. Both terms are interchangeable because they mean the same thing, though when you're asked for a velocity, you'll usually be asked for both the speed and the direction.

Explanation:

Speed=distance/time

\[\begin{array}{*{20}{l}}

{ = 400/10} \\

{ = 40m/s}

\end{array}\]

\[ = 40m/s\]

:.speed after watching lion \[ = 40m/s\]

It increases speed 3m/s per second.

:.Total speed increased= \[3 \times 10 = 30m/s\]

Speed before watching lion = \[40 - 30 = 10m/s\]

**Note:**The coordinate system used to describe the position determines the sign of the velocity. A positive velocity indicates that the object is moving in the positive coordinate system direction, while a negative velocity indicates that the object is moving in the opposite direction.

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