Aball is thrown upwards from the edge of a cliff. the horizontal velocity and vertical velocity are both 20m/s the distance from the ball to the bottom of the cliff is 100m/s. how high does the ball go? how long does it take the ball to hit the ground, from the time it leaves the child's hand?

answer:

explanation: multiply the time by the acceleration due to gravity to find the velocity when the object hits the ground. if it takes 9.9 seconds for the object to hit the ground, its velocity is (1.01 s)*(9.8 m/s^2), or 9.9 m/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 .

hi there!

out of the two, (b) precision would be more reasonable.   however, both a and b could be pretty reasonable.

-awesomerepublic   : )