Math, asked by shashaalya3, 10 months ago

A stone's throw from a river bank.Height, h in meters, the stone in
the stone in time t sconds after was thrown is h = 40t-5r^{2} .
when does the stone reach the surface of the water?

Answers

Answered by aryan1234243
0

Step-by-step explanation:

just differentiate them u get 10r use h=1/2at² u get urs answer perfectly

Answered by Anonymous
0

When particle is dropped from bridge the initial velocity u is zero.

Let the height of bridge from water level is h then the displacement traveled by particle is h.

Acceleration is g downward.

Then applying equation of motion:

s=ut+

2

1

at

2

where a=g and u=0

then, h=

2

1

g(1)

2

=

2

1

×9.8=4.9m

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