Answer:
E) I = 18.4 N.s
Explanation:
For this exercise let's use momentum momentum
I = Δp = - p₀
The energy of the stone is only kinetic
K = ½ m v²
The initial energy is Ko and the final is 70% Ko
= 0.70 K₀
energy equation
= 0.7 ½ m v₀²
You can also write
= ½ m vf²
½ m vf² = ½ m (0.7 v₀²)
= v₀ √ 0.7
Now we can calculate and imposed
I = m (-vo √0.7) - m vo
I = m vo (1 +√0.7
I = 0.5000 20.0 (1.8366)
I = 18.4 N.s
Vectors need direction and magnitude to exist, otherwise, it becomes scalars that do not require direction to be expressed.
eg - Velocity is a vector as it needs direction, but speed is scalar and does not need direction
hope this helps
Explanation:
It is given that,
Mass of the truck, m = 2000 kg
Initial velocity of the truck, u = 34 km/h = 9.44 m/s
Final velocity of the truck, v = 58 km/h = 16.11 m/s
(a) Change in truck's kinetic energy,
(b) Change in momentum of the truck,
Hence, this is the required solution.