Bob is roller-skating at a speed of 1.5 m/s relative to the ground. He tossed a small ball forward. The ball moves at a speed of 1 m/s relative to Bob. What is the speed of the ball relative to the ground?
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Subject: Physics
Velocity-addition formula gives
v= 1.5 +1 = 2.5 m/s
Elena is right but, why to make a physics question in the foreign language subject?
To determine the speed of the ball relative to the ground, we need to consider the velocities of both Bob and the ball.
Based on the information given, we know that Bob is moving at a speed of 1.5 m/s relative to the ground, and the ball is moving at a speed of 1 m/s relative to Bob.
To find the speed of the ball relative to the ground, we can use the concept of relative velocity. The relative velocity is the vector sum of the velocities of two objects.
In this case, the speed of the ball relative to the ground is the sum of the speeds of Bob and the ball. Since Bob is moving forward, his speed is positive. The velocity of the ball relative to the ground is then the sum of these velocities.
Calculating the speed of the ball relative to the ground:
Speed of ball relative to the ground = Speed of Bob + Speed of ball relative to Bob
Speed of the ball relative to the ground = 1.5 m/s + 1 m/s = 2.5 m/s
Therefore, the speed of the ball relative to the ground is 2.5 m/s.