Question

Q.NO.2: A body is moving along a straight line at a
speed of 30 m/s undergoes acceleration (retardation)
of 5 m/s2. After 2 seconds, its speed will be​

Answer 1

Answer:

Explanation:

u = 20 m/s

a = 4 m / s²

t = 2 sec

using v = u + at

v = 20 + 4* 2

v = 20 + 8 = 28 m/s

displacement = distance (since it is moving in a straight line)

= ut + 1/2 at2

= 20 * 2 + 1/2 * 4 * 22

= 40 + 8

= 48 m