A car accelerates uniformly from 18 km h –1 to 36 km h –1 in 5 s. Calculate (i) the acceleration and (ii) the distance covered by the car in that time. Also find velocity and displacements at 1s , 2s, 3s, 4s . Make observation table to show velocity an displacement at 0s, 1s, 2s, 3s, 4s, and 5s. Draw velocity time and displacement time graph with the help of observation table
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u = 18 km/hr
= 18×5/18m/s
= 5m/s
v = 36km/hr
= 36×5/18m/s
= 10m/s
i) a = (v-u)/t
= (10-5)/5
= 5/5
= 1m/s^2
ii) s = ut +1/2at^2
= 5×5 + 1×1×5^2/2
= 25 + 25/2
= 25+12.5
= 37.5 m
iii) v at 1s = u+at
= 5 +1×1
= 6
v at 2 = u+at
= 5+1×2
=7
v at 3s = 5+1×3
=8
v at 4s = 5+1×4
= 9
v at 5s = 5+5×1
= 10