Motion in a Straight Line - Result Question 35

36. A ball is thrown vertically downward with a velocity of 20m/s from the top of a tower. It hits the ground after some time with a velocity of 80m/s. The height of the tower is : .g=10m/s2) [2020]

(a) 340m

(b) 320m

(c) 300m

(d) 360m

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Answer:

Correct Answer: 36. (c)

Solution:

(c)

Using v2=u2+2gh

Height, h=v2u22g=(80)2(20)22×10

=640040020=300m



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