Question

A body falls freely from rest.Find
(a).its acceleration
(b).the distance it falls in 3s
(c).its speed after falling 70m
(d).the time required to reach a speed of 25m/s
(e)the time taken to fall 300m.
Please Answer me.

Answer 1

(a). Since, the body is falling freely from the rest, it will be having the acceleration equal to the acceleration due to the Gravity.

∴ Acceleration = g = 9.8 m/s². ≈ 10 m/s².

(b). initial velocity (u) = 0

time(t) = 3 seconds.

∴ S = ut + 1/2at²

⇒ S = 0 + 1/2 × 10 × 9

∴ S = 45 m.

(c). v² - u² = 2aS

v² = 2 × 10 × 70

∴ v = √1400

∴ v = 37.41 m/s.

(d).  v - u = at

∴ 25 - 0 = 10 × t

∴ t = 2.5 seconds.

(e). S = ut + 1/at²

∴ 300 = 0 + 1/2 × 10 × t²

∴ t² = 60

∴ t = 7.75 seconds.

Hope It Helps .

Answer 2

a). Since, the body is falling freely from the rest, it will be having the acceleration equal to the acceleration due to the Gravity.

∴ Acceleration = g = 9.8 m/s². ≈ 10 m/s².

(b). initial velocity (u) = 0

time(t) = 3 seconds.

∴ S = ut + 1/2at²

⇒ S = 0 + 1/2 × 10 × 9

∴ S = 45 m.

(c). v² - u² = 2aS

v² = 2 × 10 × 70

∴ v = √1400

∴ v = 37.41 m/s.

(d).  v - u = at

∴ 25 - 0 = 10 × t

∴ t = 2.5 seconds.


(e). S = ut + 1/at²

∴ 300 = 0 + 1/2 × 10 × t²

∴ t² = 60

∴ t = 7.75 seconds.

$Hope \: that \: this \: answer \: will \: help \: u$

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