Question

A car travelling at 20 km/h speeds upto 60 km/h in 6

sec what is its acceleration

a) 1.95 m/s² b) 1.93 m/s²

c) 1.92 m/s² d) 1.94 m/s²​

Answer 1

#BAL

u = 20km/h => 20×5/18 => 10×5/9 => 50/9 m/s

v = 60 km/h => 60×5/18 => 10×5/3 => 50/3 m/s

t = 6sec

acceleration = ?

using first equation of motion ,

v = u+at

50/3 = 50/9 + a(6)

50/3 -50/9 = 6a

150/9-50/9 = 6a

100/9 = 6a

=> 100/9×6 = a

=> 100/54 = a

=> 50/27 m/s² = a

=> 1.85 m/s² = a