A tennis player serves at a speed of 180 km/h. How long will it take for the bal

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Question: A tennis player serves at a speed of 180 km/h. How long will it take for the ball to travel 20 meters? (2021)

Options:

Correct Answer: 0.5 seconds

Exam Year: 2021

Solution:

Speed in m/s = 180 km/h * (1000 m / 1 km) * (1 h / 3600 s) = 50 m/s. Time = distance/speed = 20 m / 50 m/s = 0.4 seconds.

A tennis player serves at a speed of 180 km/h. How long will it take for the ball to travel 20 meters? (2021)

A tennis player serves at a speed of 180 km/h. How long will it take for the ball to travel 20 meters? (2021)

Step 1: Convert the speed from kilometers per hour (km/h) to meters per second (m/s).
Step 2: Use the conversion factor: 1 km = 1000 m and 1 hour = 3600 seconds.
Step 3: Calculate the speed in m/s: 180 km/h * (1000 m / 1 km) * (1 h / 3600 s) = 50 m/s.
Step 4: Identify the distance the ball needs to travel, which is 20 meters.
Step 5: Use the formula for time: Time = Distance / Speed.
Step 6: Plug in the values: Time = 20 m / 50 m/s.
Step 7: Calculate the time: Time = 0.4 seconds.

Speed Conversion – Understanding how to convert speed from kilometers per hour to meters per second.
Time Calculation – Using the formula time = distance/speed to calculate the time taken for an object to travel a certain distance.