Answer: time=4 hours
Explanation:
formula:
speed =
time =
time= x
speed = 120km/hr
distance = 480 km
x =
=
cut the zeros
and remove the signs
then
= 4
therefore, time taken to deliver the shipment by trucker is 4 hours
Felipe drives his car at a velocity of 28 m/s. He applies the brake, which slows the vehicle down at a rate of 6.4 m/s2 and caus
es it to slow to a stop. How long does it take for the car to stop? Round your answer to the nearest tenth.
I'm supposed to use derived formulas to find the answer but I don't know which one to use.
I'm supposed to use derived formulas to find the answer but I don't know which one to use.
2 answers:
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The normal force acting on the object is 500 N in the upward direction
<u>Explanation:</u>
As George is applying a downward force, the normal force will be in the upward direction. The normal force will be exerted due to the acceleration due to gravity exerted on the object.
So, as per Newton's second law, the normal force acting on the object can be measured by the product of mass of the object and the acceleration due to gravity acting on the object.
But as the acceleration due to gravity is a downward acting acceleration and the normal force is a upward acting force, so the acceleration will be having a negative sign in the formula.
Here, acceleration due to gravity g = -10 m/s² and mass is given as 50 kg, then
Normal force = 50 × (-10) = -500 N
So, the normal force acting on the object is 500 N in the upward direction.