Question

2.
A body is projected horizontally from a height with speed
20 m/s. What will be its speed after 5 seconds? (g = 10 m/s)
(a) 54 m/s (b) 20 m/s (c) 50 m/s (d) 70 m/s​

Answer 1

Answer:

answer is 20m per second

Answer 2

Heya!

Given,

ux = 20 m/s

As we know,

ax = 0

Therefore, Velocity is constant

ux = vx = 20 m/s

Now,

ay = 10 m/s²

uy = 0

t = 5 sec

v = u + at

vy = 0 + 10(5)

vy = 50 m/s

Now, magnitude of the speed is,

$= \sqrt{{vx}^{2} + {vy}^{2} }$

$= \sqrt{{50}^{2} + {20}^{2} }$

$= \sqrt{2500+ 400}$

$= \sqrt{2900 }$

$= 54$

Therefore,

Speed after 5 sec = 54 m/s