Question

6.
A body moving on straight line such that at t = 0, u = 5 m/s and acceleration a = -1 m/s, speed at
t=10 s is
(A)-5 m/s
(B) 5 m/s
(C) 10 m/s
(D) -10 m/s​

Answer 1

Given that,

Acceleration = -1 m/s²

Time t = 10 sec

Initial velocity = 5 m/s

We need to calculate the speed of the body

Using equation of motion

$v=u+at$

Where, u = initial velocity

a = acceleration

t = time

Put the value into the formula

$v=5+-1\times10$

$v=-10\ m/s$

Hence, The speed of the body is -10 m/s.

(D) is correct option.