Because if we will mental it... Think The ball a is thrown upward even it can pull downward by the gravity ball b is the fastest because the ball b has already force to hit the ground and when the gravity pull it the force that has the ball b much be faster than its original force
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The average velocity is 8 km/hrFurther explanation
This problem is about Average Velocity.
The first displacement = d₁ = 10 km
Initial velocity = v₁ = 10 km/hr
The second displacement = d₂ = 2 km
Time taken for second displacement = t₂ = 30 mins = ¹/₂ hr
Average velocity = v = ?
Firstly, we calculate the time taken for the first displacement:
Next, we could calculate the average velocity:
The average velocity is 8 km/hr
Learn moreKinetic Energy : Velocity of The Ball : Vectors of Displacement : answer details
Grade: High School
Keywords: Velocity , Driver , Car , Deceleration , Acceleration , Obstacle , Projectile , Motion , Horizontal , Vertical , Release , Point , Ball , Wall