Question

a ball is dropped from a height of 5m. find the velocity of the ball just before it reaches the ground. do you require the value of mass to find the velocith

Answer 1

Answer:

using third equation of motion:-

v^2 - u^2 = 2gh

since body is falling freely

• u = 0
• hence, v^2 =2gh

$v = \sqrt{2gh \: = \sqrt{2 \times 9.8 \times 5 } }$

$= \sqrt{98}$

= 9.9 m/s

mass is not required

Answer 2

here,

h = 5m , r = 0 , v = ?

a = g = 9.3m

According to third law of motion

v² - u² = gh

given h = 5m

here ball is falling freely,

Therefore, u = 0

hence v² = 2gh

= √ 2 × 9.8 × 5

=√ 98

= 9.9m/s

Hence , Mass is not required

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