Question

(1) A block of mass 800g is pulled from rest on a horizontal
frictionless bench by a steady force of F and it travels 16m in 2
seconds. Find:
(a) The acceleration?
(b) The value of F?

Answer 1

Answer:

a) 8m.$s^{-2}$

b) 6.4N

Explanation:

a)Using $s=ut+1/2at^{2}$

s=16

u=0

t=2

a=?

16=1/2a(4)

a=8m.$s^{-2}$

b) F=ma

Where m is in kg

Convert 800g to kg

800/1000=0.8kg (1000g in a kg)

F= 0.8 x 8 = 6.4N