A race car has a mass of 710 kg. It starts from rest and travels 40.0m in 3.0 s. The car is uniformly accelerated during the entire time. What net force is exerted on it?

An express train is moving with a velocity $\mathbf { V } _ { 1 }$ Its driver finds another train is moving on the same track in the same direction with velocity $v _ { 2 }$ s. To escape collision. driver applies retardation a on the train. The minimum time of escaping collision will be ;

In the figure, at the free end of the light string, a force $F$ is applied to keep the suspended mass of $18$\mathrm { kg }\( at rest. Assuming

1.5 kg ভরের একটি মডেল হেলকপ্টারের আদি গতিবেগ 5ĵ m/s. 2sec সমত্বরণে চলার পর তার গতিবেগ হয় (6î + 12ĵ) m/s. এই সময়ে প্রযুক্ত বলের মান নির্ণয় কর। 

The magnitude of force (in $N$) acting on a body varies with time $t$ (in $\mu s)$ as shown. $AB, BC$; and $CD$&; are straight-line segments. The magnitude of the total impulse of force on the body from $t=4\mu s$ to $t=16\mu s$ is :