Answer:
1920Joules
Explanation:
The formula for calculating the kinetic energy of a body is expressed as;
KE = 1/2 mv²
m isthe mass
V is the speed
For the two masses, the combined KE is expressed as;
KE = 1/2(m1+m2)v²
KE = 1/2(45+15)(8)²
KE = 1/2 * 60 * 64
KE = 30 * 64
KE = 1920J
Hence the combined kinetic energy of the boy and the bicycle is 1920Joules
Explanation:
The moon is the only natural satellite of the Earth and is fifth largest natural satellite in our solar system. It formed about 4.51 billion years ago.The principal features of the moon that are observable with the unaided eye are the lighter highlands, the dark maria and few large craters such as Tycho.
Answer:
30cm^3
Explanation:
ml means milliliter, 1 ml= 1cm^3 that's the unit for volume
hence
Δv=185-155=30ml=30cm^3
Answer:
Zero
Explanation:
weight of potato sack falls from an airplane is 200 N
Now velocity of fall increases, as increases the air resistance.
The air resistance is equal to 200 N , which is equal to the weight of the sack with potatoes
Then the sack's acceleration in m/s is = 200-200=Zero.
The acceleration here is based on the resistance of the air. if the air resistance is less, the velocity of the sack of potatoes would be high
Sack's acceleration in meters per second is zero
