Question

a balloon is exhilarating upwards with an acceleration of 2 metre per seconds ​

Answer 1

Explanation:

Here,

let the ballon starts from rest

so, Initial velocity of the balloon or stone be zero

acceleration = 2 m/s

time = 4 s

now,

when stone will be dropped it will be in upward motion due to inertia of motion with a retardation of 10 m/s²

so,

velocity of stone before dropping be v

now we have,

acceleration = 2 m/s²

initial velocity (u) = 0 m/s

final velocity = v

time(t)= 4 s

now,

v = u + at

= 0 + 2(4)

v = 8 m/s

now,

let it be initial velocity of stone = 8 m/s

and at highest point

final velocity = 0 m/s

acceleration = - 10 m/s²

time taken(t) = (v - u)/a

= (0 - 8)/10

t = 0.8 s

so,

total time taken to reach the highest point for stone = 4 + 0.8

= 4.8 sec

so,

Total time taken to reach ground

= 2 × 4.8

= 9.6 seconds

Answer 2

Answer:

Here,

let the ballon starts from rest

so, Initial velocity of the balloon or stone be zero

acceleration = 2 m/s

time = 4 s

now,

when stone will be dropped it will be in upward motion due to inertia of motion with a retardation of 10 m/s²

so,

velocity of stone before dropping be v

now we have,

acceleration = 2 m/s²

initial velocity (u) = 0 m/s

final velocity = v

time(t)= 4 s

now,

v = u + at

= 0 + 2(4)

v = 8 m/s

now,

let it be initial velocity of stone = 8 m/s

and at highest point

final velocity = 0 m/s

acceleration = - 10 m/s²

time taken(t) = (v - u)/a

= (0 - 8)/10

t = 0.8 s

so,

total time taken to reach the highest point for stone = 4 + 0.8

= 4.8 sec

so,

Total time taken to reach ground

= 2 × 4.8

= 9.6 seconds