Question

A ball thrown vertically upwards return to its starting point in 4s. If g = 10 m/s2

,

its initial speed was ..........​

Answer 1

Answer:

Initial speed 0.25 km/hr. It is 101 percent correct.

Explanation:

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Answer 2

using v= u + at

• take of time of flight = 2u/g 4=2u/10 = 4*10=2u 40/2 = 20