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At t = 0 s, a ball B1 is thrown vertically upward with a speed of...

At t = 0 s, a ball B1 is thrown vertically upward with a speed of 30 m/s. When B1 is 25 m above ground on the way up, a second ball B2 is thrown vertically upward from the ground with a speed of 40 m/s (Take the magnitude of the acceleration due to gravity g =10m/s2)

a) How many seconds after B1 was B2 thrown upward?

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