What is the ball\'s instantaneous acceleration at instant ti just after it leave

Question

What is the ball's instantaneous acceleration at instant ti just after it leaves your hand; at instant t2, the top of its trajectory; and at instant t3, just before it hits the ground? You throw a ball straight up with an initial speed of 10 m/s. Express your answers using two significant digits separated by commas. Enter positive value if the acceleration is upward and negative value if the acceleration is downward. a1 ,a2 ,@g SubmitP vious Ans t Answer incorrect; Try Again; 6 attempts remaining; no points deducted Your answer does not have the correct number of comma-separated terms. Part B What is its average acceleration for the upward portion of its journey(t1 to t2 ) and for the entire trip (t1 to ts )? Express your answers using two significant digits separated by commas. Enter positive value if the acceleration is upward and negative value if the acceleration is downward. a12,013 m/s2 Submit

Explanation / Answer

when you throw the ball up, the only force acting upon the ball after it leaves your hand and returns to the ground is gravitational force. There is no external force acting upon it except gravity. So from Newtons 2nd law, we know the acceleration of the ball is g or 9.8 m/s*s. Throughout the whole trip of the ball, at t1,t2,t3 acceleration is 9.8 m/s*s acting downward.

As gravity is constant throughout the journey of the ball, the average acceleration for these intervals is also 9.8 m/s*s because if a variable is constant throughout then its average value is also that constant.

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