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A tennis player hits a 0.1-kilogram tennis ball with her racket from the north end of a court. Her racket was traveling at 65 kilometers per hour. The ball accelerated at a rate of 10 meters per second squared. The ball hits the floor on the south end of the tennis court. The floor sends the ball toward the tennis player's opponent with the same acceleration. How much force did the floor on the south end of the court exert on the ball?(1 point)

Responses

7.5 N

0.01 N
0.01 N

1 N
1 N

6.5 N

3 answers

To find the force exerted by the floor on the tennis ball, we can use Newton's second law of motion, which states that \( F = m \cdot a \), where \( F \) is the force, \( m \) is the mass, and \( a \) is the acceleration.

  1. Given data:

    • Mass of the tennis ball, \( m = 0.1 \) kg
    • Acceleration of the ball after hitting the floor, \( a = 10 \) m/s²

  2. Calculating the force: \[ F = m \cdot a = 0.1 , \text{kg} \cdot 10 , \text{m/s}^2 = 1 , \text{N} \]

So, the force exerted by the floor on the tennis ball is 1 N.

Therefore, the correct response is:

1 N

The wind blows a lawn chair that weighs 4 kg into a fence with a force of 8 N. How much reaction force does the fence exert on the chair?(1 point)
Responses

0 N
0 N

0.5 N
0.5 N

8 N
8 N

2 N

According to Newton's third law of motion, for every action, there is an equal and opposite reaction. This means that if the wind exerts a force of 8 N on the lawn chair toward the fence, the fence will exert an equal and opposite force back on the lawn chair.

Thus, the reaction force exerted by the fence on the chair is 8 N.

Therefore, the correct response is:

8 N