Question

A world-class tennis player can serve a tennis ball at 130 mi/h mi/h (about 58 m/s m/s ). The length of a tennis court is 78 ft ft . Approximately how long does an opponent have to react from the instant the ball is served until the ball reaches the opponent?.

Answer 1

Answer:

The time taken is   $t = 0.4103 \ s$

Explanation:

From the question we are told that

  The  speed is  $v = 130 \ mi/h = 58 \ m/s$

   The  length of the tennis court $l = 78 \ ft = \frac{78}{3.281}= 23.8 \ m$

 Generally the time taken is mathematically represented as

      $t = \frac{ 23.8}{ 58}$

=>        $t = 0.4103 \ s$