An astronaut is accelerated in his spacecraft from rest to 800 mi./hr. In 60 sec. He was subjected to an acceleration of

Options

A. 4800 ft./sec./sec.
B. 1200 mi. /`hr^2`
C. 4800 mi./`hr^2`
D. 48000mi./`hr^2`

Answer

D

Explanation

V=at , t=60 sec. = `60/3600` hr
`800=a 60/3600=a/60`
a=48,000 `mi//hr^2`