The product of mass and velocity is momentum. P=mv. The 'P' in the equation stands for momentum.
Answer:
The work done by the child to reach the cat is, W = 3684.8 J
Explanation:
Given data,
The mass of the child, m = 40 kg
The height of the cat from the ground, h = 9.4 m
The force acting on the child due to gravitational force is,
F = mg
The minimum force required by the child to climb the tree against the gravitational force is,
F = mg
Hence, the work done by the child is,
W = F · h
= 40 x 9.8 x 9.4
= 3684.8 joules
Hence, the work done by the child to reach the cat is, W = 3684.8 J
Answer:
Option B is the correct answer.
Explanation:
Let us consider 40 meter above ground as origin.
Initial velocity = 17 m/s
Final velocity = 24 m/s
Acceleration = 9.81 m/s
We have equation of motion v² = u² + 2as
Substituting
24² = 17² + 2 x 9.81 x s
s = 14.63 m
Distance traveled by rock = 14.63 m down.
Height of rock from ground = 40 - 14.63 = 25.37 m = 25.4 m
Option B is the correct answer.
