Question

A body covers 26 m, 28 m, 30 m and 32 m in 10, 11, 12 and 13 respectively. They
a) from rest and moves with a uniform acceleration
b) from rest and moves with a uniform velocity
c) with an initial velocity and moves with a uniform acceleration
d) with an initial velocity and moves with a uniform velocity2​

Answer 1

Answer:

a)from rest and moves with a uniform acceleration

Answer 2

Answer:

c) with an initial velocity and moves with a uniform acceleration

Explanation:

The distance covered in n th second is  Sn  =u+ 1/2(2n−1)a

where u is initial velocity & a is acceleration

then, 26=u+ 19a /2 .........(1)

28=u+21a2  ....(2)

30=u+23a2  .....(3)

32=u+25a2 ......(4)

From eq. (1) & (2) we get u = 7m/sec, a=2m/sec2

∴ The body starts with initial velocity u = 7 m/sec  and moves with uniform acceleration a=2m/sec2