An 80 kg astronaut was stuck in the middle of space with only an apple. he threw the 2kg apple to the right at 20m/s. if the astronaut was 10m to the right of his spaceship, how long did it take him to reach the ship after throwing the apple?

t = 20 s

Explanation:

given,

mass of astronaut = 80 kg

mass of apple = 2 Kg

speed of the apple = 20 m/s

distance between the spaceship = 10 m

time= ?

initial velocity of astronaut = 0 m/s

using conservation of momentum

M V = m₁ v₁ + m₂ v₂

0 = 80 v₁ + 2 x 20

80 v₁ = -40

v₁ = - 0.5 m/s

- ve sign because motion is in opposite direction

distance = speed x time

t = 20 s

time taken to reach the ship is equal to 20 s

r=rho l/a where a is the area, l is the length and rho is resistivity so the greater the area the lesser the resistance thats why the earth pin is thicker bcos current follow the shortest path, so less resistive .

potential energy is directly proportional to height.

more height = more potential energy.

greatest increase in height = greatest increase in potential energy

where are the points with the greatest increase in height ?

has to be c-e or d-e .