Question

A body moving along a straight line at 50 m/sec undergoes an acceleration of 10 m/sec2 what will be it's speed after 4 sec

Answer 1

initial vel:50m/s2    final vel:?  acc:10m/s   time:4sec
fina vel= initial vel acc x time
= 50+ 10 x 4
50+40= 90m/s

Answer 2

Answer:

initial velocity (u) = 108 km/h = 108×1000m / 3600 sec. = 30 m/sec.

final velocity (v) = 0m/sec.

time(t) = 30 sec.

Acceleration (a) = v - u/ t = 0m/sec - 30m/sec / 30 sec = -30m/s / 30sec = -1 m /sec square

Explanation: