A girl is riding her bicycle. She rides 4 miles in 2.5 hours. What was her average speed?
1 answer:
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Answer:
m/s
Explanation:
Assumption: bullet leaves the muzzle at a speed of V m/s
and velocity of push received by the man be v m/s
According to newton's third law to every action there is always an equal and opposite reaction.
therefore,
mass of man× velocity = mass of bullet×its velocity
⇒70×v= 10×10^-3 ×V
solving the above eqaution we get
therefore m/s
Velocity of the fly: 1318 m/s
Explanation:
The kinetic energy of an object is the energy possessed by the object due to its motion. It can be calculated as
where
m is the mass of the object
v is its speed
For the fly in this problem, we have
is the mass
K = 5.95 J is the kinetic energy
Solving for v, we find its velocity:
Learn more about kinetic energy:
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