Question

3.A school bus covers a distance of 1200 m in 400s.Calculate its speed.

Answer 1

Answer:

Distance 1200m

Time -400s

seed=Distancin/Time

speed=1200/400

speed =3m/s

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Answer 2

Answer:

Speed is said to be distance upon time.

So, Speed = 1200/400 = 3 m/s.

Hence, the speed of the school bus is 3 m/s.

Some Important Definitions -

• Distance is length of the total path travelled by a body.
• Displacement is the shortest distance between the initial position and the final position of the body.
• Speed is distance travelled per unit time.
• Speed is a scalar quantity.
• Velocity is displacement per unit time.
• Velocity is a vector quantity.
• Acceleration is the rate of change of velocity.

Some Formulas -

• a = ∆v/∆t
• v = u + at
• v² - u² = 2as
• s = ut + ½at²
• Relative velocity = v_B - v_A
• Force = Mass × Acceleration
• nstantaneous velocity = dx/dt
• Average Displacement = ∆x/∆t
• Instantaneous Acceleration = dv/dt