Question

. A ball is thrown vertically up from top of a tower
of height 35 m with speed of 30 m/s. By, What:
speed it will hit the ground?
(1) 30 m/s
(2) 25 m/s
(3) 40 m/s
(4) 50 m/s​

Answer 1

Answer:

option no. C is correct

the speed of ball is 40 m/s when it will hit the ground.

THANK YOU

Explanation:

Answer 2

It will hit the ground at the speed of 40 m/s.

Given,

A ball is thrown vertically up from the top of a tower

of height 35 m with a speed of 30 m/s.

To Find,

The speed ball will hit the ground.

Solution,

Ball is thrown upwards,

So,

Final velocity(v)=0

Initial velocity(u)=30m/s

v²=u²-2gh

0=30×30-2×10×h

h=900÷20

h=45m(Distance travelled by ball upwards)

Total distance travelled before hitting ground:35+45=80m

So

u=0

h= -80m

Speed by which it hits the ground-

v²=u²-2gh

v²=0-2×10×-80

v=√1600

v=40m/s.

It will hit the ground at the speed of 40 m/s.

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