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A tennis player serves at a speed of 180 km/h. How long will it take for the bal
A tennis player serves at a speed of 180 km/h. How long will it take for the ball to travel 20 meters? (2021)
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Q1
A tennis player serves at a speed of 180 km/h. How long will it take for the ball to travel 20 meters? (2021)
0.4 seconds
0.5 seconds
0.6 seconds
0.7 seconds
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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.
Questions & Step-by-step Solutions
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Q
Q: A tennis player serves at a speed of 180 km/h. How long will it take for the ball to travel 20 meters? (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.
Steps: 7
Show Steps
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.
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