Science, asked by prashamshamahata, 8 months ago

A metric tons bus is running with the velocity of 72km/hr. On seeing a boy on the road 65m ahead driver jammed on the brakes .Mention weather the accident (bus hitting the boy ) happened or not with mathmatical calculation and assuming that the boy did not move from his place.
Please answer it It's argent ​

Answers

Answered by mantasha007
8

If T be the tension in the spring balance, then

Tcosθ=mg

andTsinθ=

r

mv

2

On squaring and then adding,

T

2

=(mg)

2

+(

r

mv

2

)

2

Or,T=m

g

2

+

r

2

v

4

According to question, we havev=72km/h=20m/s,r=400m,m=5kg,g=10m/s

2

Putting the above values for T , we get

T=5×

10

2

×

400

2

20

4

=50.25N(approx)

Hence Spring balance reading

10

50.25

=5.025kg

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