Answer: - 7500N
Explanation:
Given the following :
Initial Velocity of car = 108km/hr
Time taken to stop after applying brakes = 4s
Mass of passengers in car = 1000kg
Force exerted by the brakes on the car =?
After 4s, then final Velocity (V) = 0
Initial Velocity (u) of the car = 108km/hr
108km/hr = (108 × 1000)m ÷ (3600)s = 30m/s
Force exerted = mass(m) × acceleration(a)
Acceleration of car = Change in Velocity with time
a = (v - u) / t
a = (0 - 30) / 4
a = - 30/ 4
a = - 7.5m/s^2
Therefore,
Force exerted = mass(m) × acceleration(a)
Force exerted = 1000kg × (-7.5)m/s^2
Force exerted = - 7500N
Answer:
2
Explanation:
kilogram and megagram is the larger unit
Answer:easier for a sharp pin to penetrate a piece of cardboard than a blunt one
Explanation:when the same force is used. A solid resting on a horizontal surface exerts a normal contact force equals to its weight.
Answer:
m = 5 [kg]
Explanation:
To solve this problem we must use Newton's second law, which tells us that the sum of forces in a body must be equal to the product of mass by acceleration.
ΣF = m*a
Where:
F = force [N]
m = mass [kg]
a = acceleration = 4 [m/s^2]
Now replacing:
50 - 30 = m*(4)
m = 5 [kg]
