For an object moving with a uniform accleration travelling 50 meters in 5 th second and 70 meters in 7th second what is its initial velocity and acceleration and distance travelled and average velocit.
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s_5 = 50 = u + (5-1/2) a => u + 9/2 a = 50
s_7 = 70 = u + (7 - 1/2 ) a = u + 13/2 a = 70
So 2 a = 20. a = 10 m/s².
u = 5 m/s
s in 7 sec. = u t + 1/2 a t² = 5 * 7 + 1/2 * 10 * 7² = 280 m
v after 7 sec: u+a t = 75 m/s
average v = (5+75)/2 = 40 m/s
s_7 = 70 = u + (7 - 1/2 ) a = u + 13/2 a = 70
So 2 a = 20. a = 10 m/s².
u = 5 m/s
s in 7 sec. = u t + 1/2 a t² = 5 * 7 + 1/2 * 10 * 7² = 280 m
v after 7 sec: u+a t = 75 m/s
average v = (5+75)/2 = 40 m/s
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