Question

A particle Travels 400 metres after starting from rest in 20 seconds its acceleration is (a) 20m/s (b) 8000m/s (c) 20km/s (d) 40 km /s​

Answer 1

Answer:

Given ,

u = 0

S = 400 m

t = 20 sec

S = ut + 1/2 at²

S = 1/2 at²

400 = 1/2 × a × 400

200a = 400

a = 2 m/s²

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Answer 2

second equation of Newton Law of Motion

s=ut+1/2atsquare

400=0×20+1/2×a×20×20

400=0+1/2×a×400

400/400×2/1=a

2m/ssquare=a

the answer is 2m/s square