A coolie of 40kg weight carries 20kg salt and climbs up 20steps of 20 centimetre each in 2 minutes. calculate the work done by him and his power. where acceleration due to gravity is 10m/s square please help me with this
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The star betelgeuse is about 600 light-years away. if it explodes tonight, a. we'll know because debris from the explosion will rain down on us from space.b. we'll know it immediately because it will be brighter than the full moon in the sky.c. we won't know about it until 600 years from now.d. none of the above.