196 ms^-1 বেগে একটি পাথরকে উপরে নিক্ষেপ করা হলো। 10 sec পরে পাথরটির বেগ কত?

The correct answer is 98 ms^-1, which represents the speed of the stone after 10 seconds of being thrown upwards at an initial speed of 196 ms^-1.

To understand how this answer is calculated, let's break it down:

  
• The stone is thrown upwards with an initial speed of 196 ms^-1.
  
• As it moves upward, it will decelerate due to gravity, which acts in the opposite direction. The acceleration due to gravity is approximately 9.8 ms^-2.
  
• Over 10 seconds, the change in velocity can be calculated using the formula: final velocity = initial velocity - (acceleration × time).
  
• Substituting the values:     
        
  • initial velocity = 196 ms^-1
        
  • acceleration = 9.8 ms^-2 (acting downwards)
        
  • time = 10 s
      
      

  So, final velocity = 196 ms^-1 - (9.8 ms^-2 × 10 s) = 196 ms^-1 - 98 ms^-1 = 98 ms^-1.

    

Therefore, after 10 seconds, the speed of the stone will be 98 ms^-1, which corresponds to option (d).

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