74 A 2.7 g Ping-Hong ball has a diameter of 4.0 cm. a. The ball is shot straight

Question

74 A 2.7 g Ping-Hong ball has a diameter of 4.0 cm. a. The ball is shot straight up at twice its terminal speed. What is its acceleration immediately after launch? B. The ball is shot straight down at twice its terminal speed. What is its acceleration immediately after launch? Two blocks are connected by a string as in Figure P5.74. What is the upper block's acceleration if the coefficient of kinetic friction between the block and the table is 0.20? The ramp in Figure P5.75 is friction-less. If the blocks are released from rest, which way does the 10 kg block slide, and what is the magnitude of its acceleration?

Explanation / Answer

here,

74)

uk = 0.2

the accelration of the masses , a = net force /effective mass

a = ( 1 * g - uk * 2 * g ) /( 1 + 2)

a = ( 9.8 - 0.2 * 2 * 9.8) /( 3)

a = 1.96 m/s^2

the accelration of the upper block is 1.96 m/s^2

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