Question

i). An object thrown vertically upwards reaches a height of 320 m. What was its initial velocity? How long will the object take to come back to earth? (Assume g = 10 m/s 2 )

Answer 1

Explanation:

the initial velocity of the object = from object thrown.

time = distance /speed = 320m/10m/s2 =32 s²

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Answer 2

Answer:The object has its initial velocity as 80m/s and it takes 16s to come back to the earth

Explanation: h, height

u, initial velocity

T, time taken to come back to earth

h= u²/2g

u=√2gh

u=√2× 10× 320

u=√6400

u=80m/s

T=2u/g

T=2× 80/10

T=160/10

T=16s

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