A porter carries 30 bricks to a distance of 50 m in 25 s. If the weight of one brick is 12N, calculate the work done and power. [Ans: 18000J, 720W)
PHYSICS
Oasis School Science and Environment - 8
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Aball tossed vertically upward from the ground next to a building passes the bottom of a window 1.8 s after being tossed and passes the top of the window 0.20 s later. the window is 2.0 m high from top to bottom. what was the ball's initial velocity? the unit vector j^ is directed upward. how far is the bottom of the window from the launch position? how high does the ball rise above the launch position?

Iwill give brainliest if you answer right : )

A100-watt light bulb illuminates a solar cell. the electricity from the solar cell operates a water pump that delivers 1 watt of power. what is the efficiency of the system?