BILLY CAN THROW A BALL AT a maximum distance of 50m. Mary,hanging out a window t
ID: 1680756 • Letter: B
Question
BILLY CAN THROW A BALL AT a maximum distance of 50m. Mary,hanging out a window that is 30m above the ground, yells at billyto throw her the ball. billy gets directly under the window andthrows the ball straight up. a) with what speed can billy throw a ball? b) does the ball reach mary? BILLY CAN THROW A BALL AT a maximum distance of 50m. Mary,hanging out a window that is 30m above the ground, yells at billyto throw her the ball. billy gets directly under the window andthrows the ball straight up. a) with what speed can billy throw a ball? b) does the ball reach mary?Explanation / Answer
The distance whch the ball will cover in it's upward directiondepends upon the initial velocity or the velocity with which theball is thrown up. larger the initial velocity , higher the ball cantravel. If the ball can go up till 50 m, it must be thrown with theinitial velocity, given by newton's equation of motion, v2- u2= 2gs Where v = fnal velocity, u = initial velocity, g =acceleration due to gravity , s=upward dispalcement. 0 - u2= -2 x 9.8 x 50{ putting final velocity as 0and g = -9.8ms-2 u = 31.3 m/s approx. b) If the ball is thrown with the velocity of 31.3 m/s , itcan go up to 50m. As the Mary is only 30 m from the ground, the ball willdefinitely reach her and if not stopped, will go beyond her. u = 31.3 m/s approx. b) If the ball is thrown with the velocity of 31.3 m/s , itcan go up to 50m. As the Mary is only 30 m from the ground, the ball willdefinitely reach her and if not stopped, will go beyond her.Related Questions
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