Question

please give me answer ​friends

Answer 1

Answer:

-4N

Explanation:

Mass m = 1 kg

u = 20 m/s

v = 0 m/s{Stone comes to rest}

s = 50 m

By newton's 3rd equation of motion

v² - u² = 2as

⇒ (0)²- (20)² = 2 * a * 50

⇒ -400 = 100a

⇒ a = -4 m/s²

Now,

F = ma

 = 1 * (-4)

= -4 N

The negative sign shows that force of friction is opposite direction of motion,

Hope it helps!

Answer 2

Explanation:

1kg stone with velocity 20m

v=20 1kg at rest then,

v=0

v^2-u^2=2as

-400=2×a×50

a=-400/100= -4

f=F=ma

1(-4)

-4N