Question

An object with a mass 10 kg moves at a
constant velocity of 10 m/sec. A constant
force then acts for 4 second on the object
and gives it a speed of 2 m/sec in opposite
direction. The acceleration produced in it, is
(A) 3m/sec2
(B) -3m/sec2
(C) 0.3m/sec2
(D) -0.3m/sec2​

Answer 1

Answer:

B

Explanation:

v = u + at

v = -2, u = 10, t =4.

Answer 2

Answer: (B) 3m/s2

Explanation:

Ignore the mass and force..

u= 10m/s

v= -2m/s

t= 4s

Using v=u+at

-2=10+4a

4a=-12

a= -3m/s2