Answer:
The speed of the car is 20.84 m/s.
Explanation:
Given that,
The distance covered by the car, d = 150 km
Time, t = 7200 s
We need to find the speed of the car. We know that the speed of an object is given by total distance divided by total time taken. Mathematically,
So, the speed of the car is 20.84 m/s.
Answer:
Spring Constant = 279.58 N/m
Explanation:
We are given;
Mass; m = 2.05 x 10^(-2) kg = 0.0205 kg
Distance of compression; x = 8.01 × 10^(-2) m = 0.0801 m
Maximum height; h = 4.46 m
The formula for the energy in the spring is given by;
E = ½kx²
where:
k is the spring constant
x is the distance the spring is compressed.
Now, this energy of the spring will be equal to the energy of the pellet at its highest point. Energy of pallet = mgh So;
½kx² = mgh
Plugging in the relevant values, we have;
½ * k * 0.0801² = 0.0205 * 9.81 * 4.46
0.003208005k = 0.8969
k = 0.8969/0.003208005
k = 279.58 N/m
Speed = (distance covered) / (time to cover the distance).
The speed of anything that covers 42 meters in 7 seconds is
(42 meters) / (7.0 seconds)
= (42 / 7.0) (meters/second)
= 6.0 m/s .
Answer:
Explanation:
<u>First person:</u>
the rock is dropped
after t1 seconds it hit the ground, y(t)=0
<u>Second person:</u>
the rock has a initial downward speed
after t2 seconds it hit the ground, y(t)=0
the time t when the second person throws the rock after the first person release the rock is:
t=t1-t2
The answer to this question is false