Question

A body starts moving with a velocity of u ms^-1 and a acclereation of 4 m s ^-2. If the distance travelled by it is 20 m in 2 seconds, then the value of u is
a) 41 ms^-1
b) 14ms^-2
c)5ms^-1
d)10ms^-1

Answer 1

Answer:

Initial velocity is 6 m/s

Step-by-step explanation:

Given,

◉ Acceleration of the body, a = 4 m/s²

◉ Distance travelled by the body, s = 20 m/s

◉ Time taken by the body, t = 2 seconds

To Find,

◉ Initial velocity, u = ?

Formula to be used,

◉ 2nd equation of motion,

◉ s= ut + ½ × at²

Solution,

Putting all the values, we get

s= ut + ½ × at²

=> 20 = u × 2 + ½ × 4 (2)²

=> 20 = 2u + 2 × 8

=> 20 = 2u + 8

=> 20 - 8 = 2u

=> 12 = 2u

=> 12/2 = 2

=> u = 6 m/s

Hence. the initial velocity is 6 m/s.