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A ball of mass 0.2 kg thrown vertically ...

A ball of mass 0.2 kg thrown vertically upwards with a velcity of 30 m/s, reaces the highest point in 2.5 second. What is the air resistance experienced by the ball during its vertical motion? `[g=10m//s^(2)]`

A

`0.5N`

B

`0.4N`

C

10N

D

2.5N

Text Solution

Verified by Experts

The correct Answer is:
B
For the vertical motion, u = 30 m/s, v = 0
Because of air resistance, the resultant downward acceleration will increase.
For the upward motion, `v=u+at`
`therefore 0=30+a(2.5)" " therefore 2.5a=-30`
`therefore a= - (30)/(2.5)= -12m//s^(2)`
Retardation produced due to air resistance
`=(12-10)=2m//s^(2)`
`therefore` Air resistance `= mxxa= 0.2xx2=0.4N`
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