Question

Calculate the acceleration of a body which starts from rest and travels 87.5 metres in 5 seconds ?

Answer 1

given,
u=0
s=87.5 metres
t=5 sec
∴s=ut+1/2*at²
 ⇒87.5=1/2*a*25
⇒a=7m/sec²

Answer 2

Use equation of motion
S = ut + 0.5at²

a = 2S / t² ……[∵ u = 0]
= (2 × 87.5 m) / (5 s)²
= 7 m/s²

∴ Acceleration of body is 7 m/s²