Question

A projectile is thrown horizontally with a speed of 20 ms⁻¹. If g is 10 ms⁻², then the speed of the projectile after 5 second will be nearly(a) 0.5 ms⁻¹(b) 5 ms⁻¹(c) 54 ms⁻¹(d) 500 ms⁻¹

Answer 1

see the attachment for the answer

Answer 2

Vy = uy - gt ------------ (1)

here,

u = 0

g = 10

t = 5

(1) -----Vy = 0-10×5

Vy = -50

we have to find the speed

so , speed = √Vx^2 + Vy^2 ----------(2)

here ,

Vx = 20

Vy = 5

(2) --------- speed = √ 400 + 2500

= √2900

= 54 (approx)