Q1. Suppose a man lifts 20 boxes each of mass 15 kg to a height of 15 m. Determine the work
done by the man against gravity. (2)​

50 inches should be the resultant vector

the first american roller coaster was the mauch chunk switchback railway, built in the mountains of pennsylvania in the mid-1800s. the track, originally built to send coal to a railway, was reconfigured as a "scenic tour."

it was given as a lesson and guide for prayer.

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